Abstract and Applied Analysis
Volume 2019 (2019), Article ID 5926832, 14 pages
https://doi.org/10.1155/2019/5926832

Research Article

Determinantal Representations of General and (Skew-)Hermitian Solutions to the Generalized Sylvester-Type Quaternion Matrix Equation

Ivan I. Kyrchei

Pidstryhach Institute for Applied Problems of Mechanics and Mathematics, NAS of Ukraine, Lviv 79060, Ukraine

Correspondence should be addressed to Ivan I. Kyrchei; st260664@gmail.com

Received 30 June 2018; Accepted 18 December 2018; Published 6 January 2019

Academic Editor: Patricia J. Y. Wong

Copyright © 2019 Ivan I. Kyrchei. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract.

In this paper, we derive explicit determinantal representation formulas of general, Hermitian, and skew-Hermitian solutions to the generalized Sylvester matrix equation involving -Hermicity over the quaternion skew field within the framework of the theory of noncommutative column-row determinants.

1. Introduction

Let and stand for the set of all matrices and for its subset of matrices with rank , respectively, over the quaternion skew field

where is the real number field. For , the symbol stands for conjugate transpose (Hermitian adjoint) of . A matrix is Hermitian if .

The Moore-Penrose inverse of is called the unique matrix satisfying the following four equations

It is denoted by .

The two-sided generalized Sylvester matrix equation

has been well studied in matrix theory. For instance, Huang [1] obtained necessary and sufficient conditions for the existence of solutions to (3) with over the quaternion skew field. Baksalary and Kala [2] derived the general solution to (3) expressed in terms of generalized inverses which has been extended to an arbitrary division ring and on any regular ring with identity in [3, 4]. Ranks and independence of solutions to (3) were explored in [5]. In [6] expressions, as well as necessary and sufficient conditions, were given for the existence of the real and pure imaginary solutions to the consistent quaternion matrix equation (3).

The high research activities on Sylvester-type matrix equations can be observed lately. In particular, we note the following papers concerning methods of their computing solutions. Liao et al. [7] established a direct method for computing its approximate solution using the generalized singular value decomposition and the canonical correlation decomposition. Efficient iterative algorithms were presented to solve a system of two generalized Sylvester matrix equations in [8] and to solve the minimum Frobenius norm residual problem for a system of Sylvester-type matrix equations over generalized reflexive matrix in [9].

Systems of periodic discrete-time coupled Sylvester quaternion matrix equations [10], systems of quaternary coupled Sylvester-type real quaternion matrix equations [11], and optimal pole assignment of linear systems by the Sylvester matrix equations [12] have been explored. Some constraint generalized Sylvester matrix equations [13, 14] were studied recently.

Special solutions to Sylvester-type quaternion matrix equations have been actively studied. Roth’s solvability criteria for some Sylvester-type matrix equations were extended over the quaternion skew field with a fixed involutive automorphism in [15]. Şimşek et al. [16] established the precise solutions on the minimum residual and matrix nearness problems of the quaternion matrix equation for centrohermitian and skew-centrohermitian matrices. Explicit solutions to some Sylvester-type quaternion matrix equations (with -conjugation) were established by means of Kronecker map and complex representation of a quaternion matrix in [17, 18]. The expressions of the least squares solutions to some Sylvester-type matrix equations over nonsplit quaternion algebra [19] and Hermitian solutions over a split quaternion algebra [20] were derived. Solvability conditions and general solution for some generalized Sylvester real quaternion matrix equations involving -Hermicity were given in [21, 22].

Many authors have paid attention also to the Sylvester-type matrix equation involving -Hermicity

Chang and Wang [23] derived expressions for the general symmetric solution and the general minimum-2-norm symmetric solution to the matrix equation (4) within the real settings. Xu et al. [24] have given a representation of the least-squares Hermitian (skew-Hermitian) solution to the matrix equation (4). Zhang [25] obtained a representation of the general Hermitian nonnegative-definite (respectively positive-definite) solution to (4) within the complex settings. Yuan et al. [26] derived the expression of Hermitian solution for the matrix nearness problem associated with the quaternion matrix equation (4). Wang et al. [27] gave a necessary and sufficient condition for the existence and an expression for the re-nonnegative definite solution to (4) over by using the decomposition of pairwise matrices. Wang et al. [28] established the extreme ranks for the general (skew-)Hermitian solution to (4) over .

Motivated by the vast application of quaternion matrices and the latest interest of Sylvester-type quaternion matrix equations, the main goal of the paper is to derive explicit determinantal representation formulas of the general, Hermitian, and skew-Hermitian solutions to (4) based on determinantal representations of the Moore-Penrose inverse.

Determinantal representation of a solution gives a direct method of its finding analogous to classical Cramer’s rule that has important theoretical and practical significance. However, determinantal representations are not so unambiguous even for generalized inverses within the complex or real settings. Through looking for their more applicable explicit expressions, there are various determinantal representations of generalized inverses (see, e.g., [29–31]). By virtue of noncommutativity of quaternions, the problem for determinantal representation of generalized quaternion inverses is even more complicated, and only now it can be solved due to the theory of column-row determinants introduced in [32, 33]. Within the framework of the theory of row-column determinants, determinantal representations of various generalized quaternion inverses, namely, the Moore-Penrose inverse [34], the Drazin inverse [35], the W-weighted Drazin inverse [36], and the weighted Moore-Penrose inverse [37], have been derived by the author. These determinantal representations were used to obtain explicit representation formulas for the minimum norm least squares solutions [38] and weighted Moore-Penrose inverse solutions [39] to some quaternion matrix equations and explicit determinantal representation formulas of both Drazin and W-weighted Drazin inverse solutions to some restricted quaternion matrix equations and quaternion differential matrix equations [40–42]. Recently, determinantal representations of solutions to some systems of quaternion matrix equations [43, 44] and, in [45], two-sided generalized Sylvester matrix equation (3) have been derived by the author as well.

Other researchers also used the row-column determinants in their developments. In particular, Song derived determinantal representations of the generalized inverse [46] and the Bott-Duffin inverse [47]. Song et al. obtained the Cramer rules for the solutions of restricted matrix equations [48] and for the generalized Stein quaternion matrix equation [49], and so forth. Moreover, Song et al. [50] have just recently considered determinantal representations of the general solution to the generalized Sylvester matrix equation (3) over using row-column determinants as well. But their approach differs from ours because for determinantal representations of solutions we use only coefficient matrices of the equation, while in [50] supplementary matrices have been constructed and used.

The paper is organized as follows. In Section 2, we start with some remarkable results which have significant role during the construction of the main results of this paper. Elements of the theory of row-column determinants are given in Section 2.1, determinantal representations of the Moore-Penrose inverse and of the general solution to the quaternion matrix equation and its special cases are considered in Section 2.2, and the explicit determinantal representation of the general solution to (3) previously obtained within the framework of the theory of row-column determinants is in Section 2.3. The main results of the paper, namely, explicit determinantal representation formulas of the general, Hermitian, skew-Hermitian solutions to (4), are derived in Section 3. In Section 4, a numerical example to illustrate the main results is considered. Finally, in Section 5, the conclusions are drawn.

2. Preliminaries

We commence with the following preliminaries which have crucial function in the construction of the chief outcomes of the following sections.

2.1. Elements of the Theory of Row-Column Determinants

Due to noncommutativity of quaternions, a problem of defining a determinant of matrices with noncommutative entries (which is also defined as noncommutative determinants) has been unsolved for a long time. There are several versions of the definition of noncommutative determinant (see, e.g., [51–56]). But any of the previous noncommutative determinants has not fully retained those properties which it has owned for matrices with commutative entries. Moreover, if functional properties of noncommutative determinant over a ring are satisfied, then it takes on a value in its commutative subset. This dilemma can be avoided thanks to the theory of row-column determinants.

Suppose is the symmetric group on the set . Let . Row determinants of along each row can be defined as follows.

Definition 1 (see [32]). The th row determinant of is defined for all by putting

where and for all and .

Similarly, for a column determinant along an arbitrary column, we have the following definition.

Definition 2 (see [32]). The th column determinant of is defined for all by putting

where and for and .

So an arbitrary quaternion matrix inducts a set from row determinants and column determinants that are different in general. Only for Hermitian , we have [32],

which enables defining the determinant of a Hermitian matrix by putting

for all .

Its properties are similar to the properties of an usual (commutative) determinant and they have been completely explored in [32] by using row and column determinants that are so defined only by construction. We note the following that will be required below.

Lemma 3. Let . Then , .

2.2. Determinantal Representations of the Moore-Penrose Inverse with Applications to Some Quaternion Matrix Equations

For introducing determinantal representations of the Moore-Penrose inverse, the following notations will be used.

Let and be subsets of the order . denotes a submatrix of whose rows are indexed by and the columns indexed by . So denotes a principal submatrix of with rows and columns indexed by . If is Hermitian, then denotes the corresponding principal minor of .

Let denote the collection of strictly increasing sequences of integers chosen from for all . Then, for fixed and , the collection of sequences of row indexes that contain the index is denoted by ; similarly, the collection of sequences of column indexes that contain the index is denote by .

Let be the th column and be the th row of . Suppose denote the matrix obtained from by replacing its th column with the column and denote the matrix obtained from by replacing its th row with the row . Denote by and the th column and the th row of , respectively.

Theorem 4 (see [34]). If , then the Moore-Penrose inverse have the following determinantal representations,

Remark 5. For an arbitrary full-rank matrix , a column vector and a row vector we put

Remark 6. First note that . Because of symbol equivalence, we shall use the denotation as well. So by Lemma 3, for the Hermitian adjoint matrix determinantal representations of its Moore-Penrose inverse are

Since the projection matrices and are Hermitian, then and for all . So due to Theorem 4 and Remark 6 we have evidently the following corollaries.

Corollary 7. If , then the projection matrix has the determinantal representations

where and are the th column and th row of , respectively.

Corollary 8. If , then the projection matrix has the determinantal representation

where and are the th row and the th column of .

Determinantal representations of orthogonal projectors and induced from can be derived similarly.

Theorem 9 (see [3]). Let , , be known and be unknown. Then the matrix equation

is consistent if and only if . In this case, its general solution can be expressed as

where are arbitrary matrices over with allowable dimensions.

Theorem 10 (see [35]). Let , . Then the partial solution to (16) has determinantal representations,

or

where

are the column vector and the row vector, respectively. and are the th row and the th column of  .

Corollary 11. Let , be known and be unknown. Then the matrix equation is consistent if and only if . In this case, its general solution can be expressed as , where is an arbitrary matrix over with an allowable dimension. The partial solution has the following determinantal representation,

where is the th column of  .

Corollary 12. Let , be given and be unknown. Then the equation is solvable if and only if   and its general solution is , where is any matrix with an allowable dimension. Moreover, its partial solution has the determinantal representation,

where is the th row of  .

2.3. Determinantal Representations of the General Solution to the Sylvester Matrix Equation (3)

Lemma 13 (see [3]). Let , , , , . Put , , . Then the following results are equivalent.

(i)Eq. (3) has a pair solution , where , .(ii), , , .(iii), .(iv), , , .

In that case, the general solution to (3) can be expressed as

where , , , and are arbitrary matrices over obeying agreeable dimensions.

Some simplifications of (23) and (24) can be derived due to the quaternionic analog of the following proposition.

Lemma 14 (see [57]). If is Hermitian and idempotent, then for any matrix the following equations hold

Since , , and are projectors, then by Lemma 14 the simplifications of (23) and (24) are as follows:

By putting , and as zero-matrices, we obtain the partial solution to (3),

The following theorem gives determinantal representations of (27)-(28).

Theorem 15 (see [45]). Let , , , , , , . Then the pair solution (27)-(28), , , to (3) by the components

has the determinantal representation, as follows.
(i)

or

where

are the column vector and the row vector, respectively. and are the th row and the th column of .
(ii)

where is th row of .

are the column vector and the row vector, respectively. and are the th row and the th column of .
(iii)

where is the th column of , is the th column of , and

are the row vector and the column vector, respectively. and are the th column and the th row of .
(iv)

or

where

are the column vector and the row vector, respectively. and are the th row and the th column of .
(v)

where

are the row vector and the column vector, respectively. and are the th column and the th row of .

3. Determinantal Representations of the General and (Skew-)Hermitian Solutions to (4)

Now consider (4). Since for an arbitrary matrix it is evident that , so , , and . Due to the above, and , and we obtain the following analog of Lemma 13.

Lemma 16. Let , , . Put , . Then the following results are equivalent.

(i)Equation (4) has a pair solution , where , .(ii), , , .(iii), .(iv), , .

In that case, the general solution to (4) can be expressed as follows:

where , , , and are arbitrary matrices over with allowable dimensions.

By putting , , , and as zero-matrices with compatible dimensions, we obtain the following partial solution to (4),

The following theorem gives determinantal representations of (43)-(44).

Theorem 17. Let , , , . Then the partial pair solution (43)-(44) to (4), , , by the components

possesses the following determinantal representations:
(i)

or

where

are the row vector and the column vector, respectively; and are the th column and the th row of .
(ii)

where is the th row of and is such that

are the column vector and the row vector, respectively. and are the th row and the th column of and is the th row of .
(iii)

where is the th column of , the matrix such that

where is the th column of and is Hermitian adjoint to from (51).
(iv)

or

where

are the column vector and the row vector, respectively. and are the th row and the th column of .
(v)

where and such that

are the column vector and the row vector, respectively. and are the th row and the th column of .

Proof. The proof evidently follows from the proof of Theorem 15 by substitution corresponding matrices. For a better understanding more complete proof will be made in some points, and a few comments will be done in others.
(i) For the first term of (43), , we have

By using determinantal representations (9) and (13) of the Moore-Penrose inverses and , respectively, we obtain

Suppose and are the unit row vector and the unit column vector, respectively, such that all their components are , except the th components, which are . Denote . Since , then

If we denote by

the th component of a row vector , then

Further, it is evident that , so the first term of (43) has the determinantal representation (46), where is (48).
If we denote by

the th component of a column vector , then

So another determinantal representation of the first term of (43) is (47), where is (49).
(ii) For the second term of (43), we have

Using determinantal representations (9) for the Moore-Penrose inverse , (10) for , and (13) for , respectively, we obtain

Further, thinking as above in the point (i), we obtain

where

are the column vector and the row vector, respectively. and are the th row and the th column of . Construct the matrix such that are obtained by (69), and denote . Since

where is the th row of , then we have (50).
(iii) For the third term of (43), we use the determinantal representation (9) to and . Then by Corollary 11 and taking into account the fact that , we have

where is the th column of , is the th column of , is the th entry of that is Hermitian adjoint to from (51). Denote . Then,

Construct the matrix such that

Denote . Since

it follows (53).
(iv) Due to Theorem 10 and similarly as above for the first term of (44), we have the determinantal representations (55) and (56).
(v) Finally, for the second term of (44) using (14) for a determinantal representation of , and due to Theorem 10 for , we obtain

where are

are the column vector and the row vector, respectively. and are the th row and the th column of . Construct the matrix such that are obtained by (77), and denote . Since

it follows (58).

Due to [24], the following lemma can be generalized to .

Lemma 18. Suppose that matrices and and are given with . Then when (4) is solvable, it must have Hermitian (skew-Hermitian) solutions.

The general Hermitian solution to (4) can be expressed as , , where is an arbitrary solution to (4). Since by Lemma 18 the existence of Hermitian solutions to (4) needs that is Hermitian, then

It is evident that the determinantal representations of and can be obtained as for all   and   for all , where and are determined by Theorem 15 and

Moreover, for all has the following determinantal representations.

(i)

(ii)

where is the th column of that is Hermitian adjoint to from the point (i) of Theorem 17, and is such that

are the row vector and the column vector, respectively. and are the th column and the th row of .

(iii)

where is the th row of , the matrix such that

where is the th row of , and is obtained by (51).

Similarly, for all has the following determinantal representations.

(i)

where

are the row vector and the column vector, respectively. and are the th column and the th row of .

(ii)

where and such that

are the row vector and the column vector, respectively. and are the th column and the th row of .

Remark 19. By Lemma 18, if and (4) is solvable, then it has skew-Hermitian solutions. The general skew-Hermitian solution to (4) can be expressed as , , where is an arbitrary solution to (4). So due to the above one we can obtain corresponding determinantal representations of skew-Hermitian solution.

4. An Example

In this section, we give an example to illustrate our results. Let us consider the matrix equation

where

Since , then , and, evidently, . By Theorem 4, one can find

and . It is easy to check that (91) is consistent. First, we can find the solution to (91) by direct calculation. By (43),

and by (43)

Now, we find the solution to (91) by determinantal representations. So,

Since

and , , then

So obtained by Cramer’s rule and the matrix method (94) are equal.

Similarly, we can obtain for all , and .

5. Conclusions

Within the framework of the theory of row-column determinants, we have derived explicit determinantal representation formulas (analogs of Cramer’s rule) of the general, Hermitian, and skew-Hermitian solutions to the Sylvester-type matrix equation over the quaternion skew field. To accomplish that goal, we have used determinantal representations of the Moore-Penrose matrix inverse, which were previously introduced by the author.

Data Availability

The data used to support the findings of this study are included within the article titled “Determinantal Representations of General Solutions to the Generalized Sylvester Quaternion Matrix Equation and Its Type”. The prior studies (and datasets) are cited at relevant places within the text.

Conflicts of Interest

The author declares that he has no conflicts of interest.

References

L. Huang, “The matrix equation over the quaternion field,” Linear Algebra and Its Applications, vol. 234, pp. 197–208, 1996.

J. K. Baksalary and R. Kala, “The matrix equation ,” Linear Algebra and its Applications, vol. 30, pp. 141–147, 1980.

Q. Wang, “A system of matrix equations and a linear matrix equation over arbitrary regular rings with identity,” Linear Algebra and its Applications, vol. 384, pp. 43–54, 2004.

Q.-W. Wang, J. W. van der Woude, and H.-X. Chang, “A system of real quaternion matrix equations with applications,” Linear Algebra and its Applications, vol. 431, no. 1, pp. 2291–2303, 2009.

Y. Tian, “Ranks and independence of solutions of the matrix equation ,” Acta Mathematica Universitatis Comenianae, vol. 1, pp. 75–84, 2006.

Q. W. Wang, H. S. Zhang, and S. W. Yu, “On solutions to the quaternion matrix equation ,” Electronic Journal of Linear Algebra, vol. 17, pp. 343–358, 2008.

A.-P. Liao, Z.-Z. Bai, and Y. Lei, “Best approximate solution of matrix equation ,” SIAM Journal on Matrix Analysis and Applications, vol. 27, no. 3, pp. 675–688, 2005.

Y. Lin and Q.-W. Wang, “Iterative Solution to a System of Matrix Equations,” Abstract and Applied Analysis, vol. 2013, Article ID 124979, 7 pages, 2013.

F. Yin and G.-X. Huang, “An iterative algorithm for the least squares generalized reflexive solutions of the matrix equations ,” Abstract and Applied Analysis, vol. 2012, Article ID 857284, 18 pages, 2012.

H.-F. He, G.-B. Cai, and X.-J. Han, “Optimal Pole Assignment of Linear Systems by the Sylvester Matrix Equations,” Abstract and Applied Analysis, vol. 2014, Article ID 301375, 7 pages, 2014.

Z.-H. He, Q.-W. Wang, and Y. Zhang, “A system of quaternary coupled Sylvester-type real quaternion matrix equations,” Automatica, vol. 87, pp. 25–31, 2018.

Z. H. He and Q. W. Wang, “A system of periodic discrete-time coupled Sylvester quaternion matrix equations,” Algebra Colloquium, vol. 24, no. 1, pp. 169–180, 2017.

Q.-W. Wang, A. Rehman, Z.-H. He, and Y. Zhang, “Constraint generalized Sylvester matrix equations,” Automatica, vol. 69, pp. 60–64, 2016.

A. Rehman, Q.-W. Wang, I. Ali, M. Akram, and M. O. Ahmad, “A constraint system of generalized Sylvester quaternion matrix equations,” Advances in Applied Clifford Algebras (AACA), vol. 27, no. 4, pp. 3183–3196, 2017.

V. Futorny, T. Klymchuk, and V. V. Sergeichuk, “Roth's solvability criteria for the matrix equations and over the skew field of quaternions with an involutive automorphism ,” Linear Algebra and Its Applications, vol. 510, pp. 246–258, 2016.

S. Şimşek, M. Sarduvan, and H. Özdemir, “Centrohermitian and skew-centrohermitian solutions to the minimum residual and matrix nearness problems of the quaternion matrix equation ,” Advances in Applied Clifford Algebras (AACA), vol. 27, no. 3, pp. 2201–2214, 2017.

C. Song and G. Chen, “On solutions of matrix equation and ,” Applied Mathematics and Computation, vol. 37, pp. 57–68, 2011.

C. Q. Song, G. L. Chen, and Q. B. Liu, “Explicit solutions to the quaternion matrix equations ,” International Journal of Computer Mathematics, vol. 89, no. 7, pp. 890–900, 2012.

S. Yuan and A. Liao, “Least squares solution of the quaternion matrix equation with the least norm,” Linear and Multilinear Algebra, vol. 59, pp. 985–998, 2011.

S.-F. Yuan, Q.-W. Wang, Y.-B. Yu, and Y. Tian, “On Hermitian solutions of the split quaternion matrix equation ,” Advances in Applied Clifford Algebras (AACA), vol. 27, no. 4, pp. 3235–3252, 2017.

X. Zhang, “A system of generalized Sylvester quaternion matrix equations and its applications,” Applied Mathematics and Computation, vol. 273, pp. 74–81, 2016.

A. Rehman, Q.-W. Wang, and Z.-H. He, “Solution to a system of real quaternion matrix equations encompassing -Hermicity,” Applied Mathematics and Computation, vol. 265, pp. 945–957, 2015.

X. W. Chang and J. S. Wang, “The symmetric solution of the matrix equations ,” Linear Algebra and its Applications, vol. 179, pp. 171–189, 1993.

G. P Xu, M. S. Wei, and D. S. Zheng, “On solutions of matrix equation ,” Linear Algebra and its Applications, vol. 279, pp. 93–109, 1998.

X. Zhang, “The general Hermitian nonnegative-definite and positive-definite solutions to the matrix equation ,” Journal of Applied Mathematics & Computing, vol. 14, no. 1-2, pp. 51–67, 2004.

S. Yuan, A. Liao, and G. Yao, “The matrix nearness problem associated with the quaternion matrix equation ,” Applied Mathematics and Computation, vol. 37, no. 1-2, pp. 133–144, 2011.

Q. W. Wang and F. Zhang, “The reflexive re-nonnegative definite solution to a quaternion matrix equation,” Electronic Journal of Linear Algebra, vol. 17, pp. 88–101, 2008.

Q. W. Wang and J. Jiang, “Extreme ranks of (skew-)Hermitian solutions to a quaternion matrix equation,” Electronic Journal of Linear Algebra, vol. 20, pp. 552–573, 2010.

R. B. Bapat, K. P. S. Rao, and K. M. Prasad, “Generalized inverses over integral domains,” Linear Algebra and its Applications, vol. 140, pp. 181–196, 1990.

P. Stanimirovic, “General determinantal representation of pseudoinverses of matrices,” Matematicki Vesnik, vol. 48, pp. 1–9, 1996.

I. I. Kyrchei, “Cramer’s rule for generalized inverse solutions,” in Advances in Linear Algebra Research, I. I. Kyrchei, Ed., pp. 79–132, Nova Science Publishers, New York, NY, USA, 2015.

I. I. Kyrchei, “Cramer's rule for quaternion systems of linear equations,” Fundamentalnaya i Prikladnaya Matematika, vol. 13, no. 4, pp. 67–94, 2007.

I. Kyrchei, “The theory of the column and row determinants in a quaternion linear algebra,” in Advances in Mathematics Research, A. R. Baswell, Ed., vol. 15, pp. 301–359, Nova Science Publishers, New York, NY, USA, 2012.

I. I. Kyrchei, “Determinantal representations of the Moore-Penrose inverse over the quaternion skew field and corresponding Cramer's rules,” Linear and Multilinear Algebra, vol. 59, no. 4, pp. 413–431, 2011.

I. Kyrchei, “Determinantal representations of the Drazin inverse over the quaternion skew field with applications to some matrix equations,” Applied Mathematics and Computation, vol. 238, pp. 193–207, 2014.

I. Kyrchei, “Determinantal representations of the W-weighted Drazin inverse over the quaternion skew field,” Applied Mathematics and Computation, vol. 264, pp. 453–465, 2015.

I. Kyrchei, “Weighted singular value decomposition and determinantal representations of the quaternion weighted Moore-Penrose inverse,” Applied Mathematics and Computation, vol. 309, pp. 1–16, 2017.

I. Kyrchei, “Explicit representation formulas for the minimum norm least squares solutions of some quaternion matrix equations,” Linear Algebra and its Applications, vol. 438, no. 1, pp. 136–152, 2013.

I. I. Kyrchei, “Determinantal representations of the quaternion weighted moore-penrose inverse and its applications,” in Advances in Mathematics Research, A. R. Baswell, Ed., vol. 23, pp. 35–96, Nova Science Publishers, New York, NY, USA, 2017.

I. Kyrchei, “Explicit determinantal representation formulas of W-weighted Drazin inverse solutions of some matrix equations over the quaternion skew field,” Mathematical Problems in Engineering, vol. 2016, Article ID 8673809, 13 pages, 2016.

I. Kyrchei, “Determinantal representations of the Drazin and W-weighted Drazin inverses over the quaternion skew field with applications,” in Quaternions: Theory and Applications, S. Griffin, Ed., pp. 201–275, Nova Science Publishers, New York, NY, USA, 2017.

I. Kyrchei, “Explicit determinantal representation formulas for the solution of the two-sided restricted quaternionic matrix equation,” Applied Mathematics and Computation, vol. 58, no. 1-2, pp. 335–365, 2018.

I. Kyrchei, “Determinantal representations of solutions to systems of quaternion matrix equations,” Advances in Applied Clifford Algebras (AACA), vol. 28, p. 23, 2018.

I. I. Kyrchei, “Cramer's rules for the system of two-sided matrix equations and of its special cases,” in Matrix Theory - Applications and Theorems, H. A. Yasser, Ed., pp. 3–20, IntechOpen, 2018.

I. I. Kyrchei, “Cramer's rules for Sylvester quaternion matrix equation and its special cases,” Advances in Applied Clifford Algebras (AACA), vol. 28, p. 90, 2018.

G.-J. Song, “Determinantal representation of the generalized inverses over the quaternion skew field with applications,” Applied Mathematics and Computation, vol. 219, no. 2, pp. 656–667, 2012.

G.-J. Song, “Bott-Duffin inverse over the quaternion skew field with applications,” Applied Mathematics and Computation, vol. 41, no. 1-2, pp. 377–392, 2013.

G.-J. Song, Q.-W. Wang, and H.-X. Chang, “Cramer rule for the unique solution of restricted matrix equations over the quaternion skew field,” Computers & Mathematics with Applications, vol. 61, no. 6, pp. 1576–1589, 2011.

C. Song, X. Wang, and X. Zhang, “On solutions of the generalized Stein quaternion matrix equation,” Applied Mathematics and Computation, vol. 43, no. 1-2, pp. 115–131, 2013.

G.-J. Song, Q.-W. Wang, and S.-W. Yu, “Cramer's rule for a system of quaternion matrix equations with applications,” Applied Mathematics and Computation, vol. 336, pp. 490–499, 2018.

H. Aslaksen, “Quaternionic determinants,” The Mathematical Intelligencer, vol. 18, no. 3, pp. 57–65, 1996.

L. X. Chen, “Definition of determinant and Cramer solutions over the quaternion field,” Acta Mathematica Sinica, vol. 7, no. 2, pp. 171–180, 1991.

N. Cohen and S. De Leo, “The quaternionic determinant,” Electronic Journal of Linear Algebra, vol. 7, pp. 100–111, 2000.

J. Dieudonne, “Les determinantes sur un corps non-commutatif,” Bulletin de la Société Mathématique de France, vol. 71, pp. 27–45, 1943.

F. J. Dyson, “Quaternion determinants,” Helvetica Physica Acta, vol. 45, pp. 289–302, 1972.

I. Gelfand, S. Gelfand, V. Retakh, and R. L. Wilson, “Quasideterminants,” Advances in Mathematics, vol. 193, no. 1, pp. 56–141, 2005.

A. A. Maciejewski and C. A. Klein, “Obstacle avoidance for kinematically redundant manipulators in dynamically varying environments,” International Journal of Robotics Research, vol. 4, no. 3, pp. 109–117, 1985.