Edit Profile Hartwig, Robert E. Compute Distance To: Compute Author ID: hartwig.robert-e Published as: Hartwig, R.; Hartwig, R. E.; Hartwig, Robert; Hartwig, Robert E. Documents Indexed: 123 Publications since 1969, including 1 Book all top 5 Co-Authors 40 single-authored 12 Hall, Frank J. 12 Patrício, Pedro 6 Chen, Xuzhou 5 Bevis, Jean H. 5 Katz, Irving Jack 4 Levine, Jack 4 Luh, Jiang 4 Mani, Vaidyanath 3 Putcha, Mohan S. 3 Šemrl, Peter 3 Spindelböck, Klaus 3 Styan, George P. H. 2 Bapat, Ravindra Bhalchandra 2 Mitra, Sujit Kumar 2 Morris, S. Brent 2 Neumann, Michael 2 Puystjens, Roland 2 Shoaf, James M. 2 Wei, Yimin 1 Barnett, Stephen 1 Bérubé, Julie 1 Castro González, Nieves 1 Drazin, Michael P. 1 Fisher, Michael E. 1 Gabriel, Richard P. 1 Hartmann, Wolfgang M. 1 Kang, Min 1 Kirkland, Steve J. 1 Li, Xiezhang 1 Loewy, Raphael 1 Maroulas, John 1 Newman, Morris 1 Omladič, Matjaž 1 Poplin, Phillip L. 1 Prasad, K. Manjunatha 1 Rose, Nicholas J. 1 Shoaf, Jim 1 Wang, Guorong all top 5 Serials 37 Linear Algebra and its Applications 12 Linear and Multilinear Algebra 7 SIAM Journal on Applied Mathematics 6 ELA. The Electronic Journal of Linear Algebra 5 Mathematica Japonica 5 Proceedings of the American Mathematical Society 4 Pacific Journal of Mathematics 4 Cryptologia 4 SIAM Journal on Matrix Analysis and Applications 3 Revue Roumaine de Mathématiques Pures et Appliquées 3 Industrial Mathematics 2 American Mathematical Monthly 2 Archive for Rational Mechanics and Analysis 2 Applied Mathematics and Computation 2 Journal of the Australian Mathematical Society 1 Discrete Mathematics 1 International Journal of Systems Science 1 Journal of Mathematical Analysis and Applications 1 Rocky Mountain Journal of Mathematics 1 Bulletin of the Calcutta Mathematical Society 1 Czechoslovak Mathematical Journal 1 Sankhyā. Series A. Methods and Techniques 1 Boletim da Sociedade Portuguesa de Matemática 1 Aequationes Mathematicae 1 Journal of the Australian Mathematical Society. Series A 1 SIAM Journal on Mathematical Analysis 1 SIAM Journal on Optimization 1 Numerical Linear Algebra with Applications 1 Operators and Matrices all top 5 Fields 97 Linear and multilinear algebra; matrix theory (15-XX) 22 Associative rings and algebras (16-XX) 12 Numerical analysis (65-XX) 10 Order, lattices, ordered algebraic structures (06-XX) 4 Systems theory; control (93-XX) 4 Information and communication theory, circuits (94-XX) 3 Combinatorics (05-XX) 3 Group theory and generalizations (20-XX) 3 Approximations and expansions (41-XX) 2 Ordinary differential equations (34-XX) 2 Sequences, series, summability (40-XX) 2 Functional analysis (46-XX) 2 Operator theory (47-XX) 2 Statistics (62-XX) 1 General and overarching topics; collections (00-XX) 1 History and biography (01-XX) 1 Field theory and polynomials (12-XX) 1 Nonassociative rings and algebras (17-XX) 1 Difference and functional equations (39-XX) Publications by Year all cited Publications top 5 cited Publications Citations contained in zbMATH Open 103 Publications have been cited 1,315 times in 842 Documents Cited by ▼ Year ▼ How to partially order regular elements. Zbl 0442.06006Hartwig, Robert E. 122 1980 Some additive results on Drazin inverse. Zbl 0967.15003Hartwig, Robert E.; Wang, Guorong; Wei, Yimin 95 2001 Representations for the Drazin inverse of a \(2 \times 2\) block matrix. Zbl 1100.15003Hartwig, Robert; Li, Xiezhang; Wei, Yimin 70 2006 Block generalized inverses. Zbl 0335.15004Hartwig, Robert E. 62 1976 On some characterizations of the ”star” partial ordering for matrices and rank subtractivity. Zbl 0603.15001Hartwig, Robert E.; Styan, George P. H. 60 1986 Group inverses and Drazin inverses of bidiagonal and triangular Toeplitz matrices. Zbl 0372.15003Hartwig, R. E.; Shoaf, J. 53 1977 The reverse order law revisited. Zbl 0584.15002Hartwig, R. E. 47 1986 Matrices for which A* and A+ commute. Zbl 0525.15006Hartwig, Robert E.; Spindelboeck, Klaus 45 1983 The group inverse of a companion matrix. Zbl 0890.15003Puystjens, R.; Hartwig, R. E. 40 1997 The matrix equation \(A\bar X-AB=C\) and its special cases. Zbl 0655.15013Bevis, Jean H.; Hall, Frank J.; Hartwig, Robert E. 35 1988 A note on the group structure of unit regular ring elements. Zbl 0355.16005Hartwig, Robert E.; Luh, Jiang 29 1977 More on the Souriau-Frame algorithm and the Drazin inverse. Zbl 0335.15008Hartwig, R. E. 26 1976 Partial orders based on outer inverses. Zbl 0778.15003Mitra, Sujit Kumar; Hartwig, Robert E. 25 1992 Lattice properties of the *-order for complex matrices. Zbl 0485.15014Hartwig, Robert E.; Drazin, Michael P. 25 1982 Determinantal identities over commutative semirings. Zbl 1057.15009Poplin, Phillip L.; Hartwig, Robert E. 24 2004 Asymptotic behavior of Toeplitz matrices and determinants. Zbl 0169.04403Hartwig, R. E.; Fisher, M. E. 24 1969 Some additive results on Drazin inverses. Zbl 1182.65067Patrício, P.; Hartwig, R. E. 23 2009 When is a matrix a sum of idempotents? Zbl 0696.15011Hartwig, Robert E.; Putcha, Mohan S. 23 1990 On products of EP matrices. Zbl 0868.15015Hartwig, Robert E.; Katz, Irving J. 22 1997 Applications of the Drazin inverse to the Hill cryptographic system. III. Zbl 0491.94015Hartwig, Robert E.; Levine, Jack 22 1981 Resultants and the solution of AX - XB = - C. Zbl 0222.15007Hartwig, Robert E. 22 1972 A note on the partial ordering of positive semi-definite matrices. Zbl 0408.15015Hartwig, Robert E. 18 1978 Singular value decomposition and the Moore-Penrose inverse of bordered matrices. Zbl 0335.15006Hartwig, Robert E. 18 1976 The \((2,2,0)\) group inverse problem. Zbl 1204.15014Patrício, P.; Hartwig, R. E. 17 2010 The group inverse of a triangular matrix. Zbl 0851.15005Chen, Xuzhou; Hartwig, Robert E. 17 1996 When is a matrix a difference of two idempotents? Zbl 0696.15010Hartwig, Robert E.; Putcha, Mohan S. 15 1990 Consimilarity and the matrix equation \(A\bar X-XB=C\). Zbl 0655.15012Bevis, Jean H.; Hall, Frank J.; Hartwig, Robert E. 14 1987 Roth’s equivalence problem in unit regular rings. Zbl 0347.15005Hartwig, Robert E. 14 1976 1-2 inverses and the invariance of \(BA^+C\). Zbl 0312.15001Hartwig, Robert E. 12 1975 The \((2,2,0)\) Drazin inverse problem. Zbl 1261.15008Patrício, P.; Hartwig, R. E. 11 2012 The hyperpower iteration revisited. Zbl 0848.65021Chen, Xu-Zhou; Hartwig, Robert E. 11 1996 Partial isometries, contractions and EP matrices. Zbl 0575.15008Hartwig, Robert E.; Spindelböck, Klaus 11 1983 On finite regular rings. Zbl 0326.16012Hartwig, Robert E.; Luh, Jiang 11 1976 Bounds on the exponent of primitivity which depend on the spectrum and the minimal polynomial. Zbl 0790.15016Hartwig, Robert E.; Neumann, Michael 9 1993 Roth’s removal rule revisited. Zbl 0509.15004Hartwig, Robert E. 9 1983 Applications of the Drazin inverse to the Hill cryptographic system. I. Zbl 0427.94015Levine, Jack; Hartwig, Robert E. 9 1980 Further results on generalized inverses of partitioned matrices. Zbl 0345.15005Hall, Frank J.; Hartwig, Robert E. 9 1976 The link between regularity and strong-pi-regularity. Zbl 1204.15015Patrício, Pedro; Hartwig, R. E. 8 2010 Applications of the Drazin inverse to Cesaro-Neumann iterations. Zbl 0506.65016Hartwig, R. E.; Hall, F. J. 8 1982 A method for calculating Drazin inverse of square matrix A. Zbl 0458.15002Hartwig, Robert E. 8 1981 A note on rank-additivity. Zbl 0456.15002Hartwig, Robert E. 8 1981 Generalized polynomial bases and the Bézoutian. Zbl 0873.15016Mani, Vaidyanath; Hartwig, Robert E. 7 1997 On the derivative of the Drazin inverse of a complex matrix. Zbl 0401.15003Hartwig, Robert E.; Shoaf, Jim 7 1979 Rank factorization and Moore-Penrose inversion. Zbl 0335.15005Hartwig, Robert E. 7 1976 Semisimilarity for matrices over a division ring. Zbl 0467.15007Hartwig, Robert E.; Putcha, Mohan S. 6 1981 Pseudo-similarity for matrices over a field. Zbl 0386.15013Hartwig, R. E.; Hall, F. J. 6 1978 The universal flip matrix and the generalized faro-shuffle. Zbl 0316.15013Hartwig, Robert E.; Morris, S. Brent 6 1975 The resultant and the matrix equation AX = XB. Zbl 0243.15008Hartwig, Robert E. 6 1972 On canonical correlations and the degrees of non-orthogonality in the three-way layout. Zbl 0858.62045Bérubé, Julie; Hartwig, Robert E.; Styan, George P. H. 5 1993 An algebraic-analytic approach to nonnegative bases. Zbl 0708.15003Hartwig, Robert E.; Neumann, Michael; Rose, Nicholas J. 5 1990 Some closed form formulae for the intersection of two special matrices under the star order. Zbl 0575.15009Hartwig, Robert E.; Spindelböck, Klaus 5 1983 Pseudo-similarity and partial unit regularity. Zbl 0544.15005Hall, Frank J.; Hartwig, Robert E.; Katz, Irving J.; Newman, Morris 5 1983 Applications of the Wronskian and Gram matrices of \(\{t^ j \exp(\lambda_ k t)\}\). Zbl 0489.34023Hartwig, Robert E. 5 1982 Generalized inverses, EP elements and associates. Zbl 0376.16012Hartwig, Robert E. 5 1978 When does the Moore-Penrose inverse flip? Zbl 1241.15004Hartwig, R. E.; Patrício, P. 4 2012 Some properties of the \(q\)-adic Vandermonde matrix. Zbl 0851.15017Mani, Vaidyanath; Hartwig, Robert E. 4 1996 Generalizations of the spectral theorem for matrices. II. Matrix polynomials over arbitrary fields. Zbl 0548.15026Hartwig, R. E. 4 1984 On a theorem of Flanders. Zbl 0508.15008Hartwig, Robert E. 4 1982 An application of the Moore-Penrose inverse to antisymmetric relations. Zbl 0444.16005Hartwig, Robert E. 4 1980 Pseudo lattice properties of the star-orthogonal partial ordering for star-regular rings. Zbl 0423.06013Hartwig, Robert E. 4 1979 The generalized faro shuffle. Zbl 0334.05034Morris, S. Brent; Hartwig, Robert E. 4 1976 AX-XB=C, resultants and generalized inverses. Zbl 0268.15004Hartwig, Robert E. 4 1975 Note on a linear difference equation. Zbl 1132.39001Hartwig, Robert E. 3 2006 Diagonalizing triangular matrices via orthogonal Pierce decompositions. Zbl 1074.15006Hartwig, R. E.; Patrício, P.; Puystjens, R. 3 2005 On some characterizations of pairwise star orthogonality using rank and dagger additivity and subtractivity. Zbl 0848.15013Hartwig, Robert E.; Omladič, Matjaž; Šemrl, Peter; Styan, George P. H. 3 1996 EP perturbations. Zbl 0835.15001Hartwig, Robert E. 3 1994 Maximal elements under the three partial orders. Zbl 0767.15017Hartwig, Robert E.; Loewy, Raphael 3 1992 The group inverse of a block triangular matrix. Zbl 0661.15003Hartwig, Robert E. 3 1987 The Drazin inverse as a gradient. Zbl 0562.15001Gabriel, Richard; Hartwig, Robert E. 3 1984 Applications of the Drazin inverse to the Hill cryptographic system. IV. Zbl 0491.94016Hartwig, Robert E.; Levine, Jack 3 1981 Schur’s theorem and the Drazin inverse. Zbl 0362.15003Hartwig, Robert E. 3 1978 Invariance under outer inverses. Zbl 1390.15011Hartwig, R. E.; Patrício, P. 2 2018 On Roth’s pseudo equivalence over rings. Zbl 1158.15009Hartwig, R. E.; Patricio, Pedro 2 2007 Duality and black box interpolation. I: The one variable nonderogatory case. Zbl 0853.15006Mani, Vaidyanath; Hartwig, Robert E. 2 1995 The weighted \(*\)-core-nilpotent decomposition. Zbl 0813.15002Hartwig, Robert E. 2 1994 A remark on the characterization of the parallel sum of two matrices. Zbl 0638.15003Hartwig, Robert E. 2 1987 A note on light matrices. Zbl 0637.15016Hartwig, Robert E. 2 1987 Pseudo-consimilarity and semi-consimilarity of complex matrices. Zbl 0629.15005Bevis, Jean H.; Hall, Frank J.; Hartwig, Robert E. 2 1987 Resultants, companion matrices, and Jacobson chains. Zbl 0622.15003Hartwig, Robert E. 2 1987 Block striped and block nested matrices. Zbl 0592.15005Hartwig, R. E.; Hall, F. J.; Katz, I. J. 2 1985 Drazin inverses and canonical forms in \(M_ 0(\)Z/h). Zbl 0455.15003Hartwig, Robert E. 2 1981 Applications of the Drazin inverse to the Hill cryptographic system. II. Zbl 0444.94012Levine, Jack; Hartwig, Robert E. 2 1980 Invariance, group inverses and parallel sums. Zbl 0432.16009Hartwig, Robert E.; Shoaf, J. M. 2 1980 Theory and applications of matrix perturbations, with respect to Hankel matrices and power formulae. Zbl 0401.93021Hartwig, Robert E. 2 1979 A note on pseudo-similarity of matrices. Zbl 0398.15009Hall, Frank J.; Hartwig, Robert E.; Katz, Irving J. 2 1978 Spectral inverses and the row-space equations. Zbl 0388.15002Hartwig, Robert E. 2 1978 A note on periodic matrices. Zbl 0391.15004Hartwig, Robert E. 2 1977 A note on Jacobson chains. Zbl 0222.15006Hartwig, Robert E. 2 1972 Toeplitz determinants and Szegö’s formula. Zbl 0174.31604Hartwig, R. E. 2 1969 Perturbation results and the forward order law for the Moore-Penrose inverse of a product. Zbl 1405.15007Castro-González, Nieves; Hartwig, Robert E. 1 2018 Some regular sums. Zbl 1307.15008Patrício, P.; Hartwig, R. E. 1 2015 Two by two units. Zbl 1327.15004Hartwig, R. E.; Patrício, P. 1 2014 A note on power bounded matrices. Zbl 1251.15016Hartwig, R. E.; Patricio, P. 1 2012 The Picard iteration and its application. Zbl 1103.65034Chen, Xuzhou; Hartwig, Robert E. 1 2006 Constrained convergence. Zbl 0930.65032Hartwig, Robert E.; Šemrl, Peter 1 1999 Power additivity and orthogonality. Zbl 0924.15007Hartwig, Robert E.; Šemrl, Peter 1 1998 Computing the Moore-Penrose inverse for the covariance matrix in constrained nonlinear estimation. Zbl 0874.62069Hartmann, Wolfgang M.; Hartwig, Robert E. 1 1996 Roth’s removal rule and the rational canonical form. Zbl 0861.15010Hartwig, Robert E. 1 1996 A convexity result for complex numbers with applications to nonnegative normal matrices. Zbl 0823.15019Kirkland, Steve; Hartwig, Robert E. 1 1995 The pyramid decomposition and rank minimization. Zbl 0797.15013Hartwig, Robert E. 1 1993 Invariance under outer inverses. Zbl 1390.15011Hartwig, R. E.; Patrício, P. 2 2018 Perturbation results and the forward order law for the Moore-Penrose inverse of a product. Zbl 1405.15007Castro-González, Nieves; Hartwig, Robert E. 1 2018 Some regular sums. Zbl 1307.15008Patrício, P.; Hartwig, R. E. 1 2015 Two by two units. Zbl 1327.15004Hartwig, R. E.; Patrício, P. 1 2014 The \((2,2,0)\) Drazin inverse problem. Zbl 1261.15008Patrício, P.; Hartwig, R. E. 11 2012 When does the Moore-Penrose inverse flip? Zbl 1241.15004Hartwig, R. E.; Patrício, P. 4 2012 A note on power bounded matrices. Zbl 1251.15016Hartwig, R. E.; Patricio, P. 1 2012 The \((2,2,0)\) group inverse problem. Zbl 1204.15014Patrício, P.; Hartwig, R. E. 17 2010 The link between regularity and strong-pi-regularity. Zbl 1204.15015Patrício, Pedro; Hartwig, R. E. 8 2010 Some additive results on Drazin inverses. Zbl 1182.65067Patrício, P.; Hartwig, R. E. 23 2009 On Roth’s pseudo equivalence over rings. Zbl 1158.15009Hartwig, R. E.; Patricio, Pedro 2 2007 Representations for the Drazin inverse of a \(2 \times 2\) block matrix. Zbl 1100.15003Hartwig, Robert; Li, Xiezhang; Wei, Yimin 70 2006 Note on a linear difference equation. Zbl 1132.39001Hartwig, Robert E. 3 2006 The Picard iteration and its application. Zbl 1103.65034Chen, Xuzhou; Hartwig, Robert E. 1 2006 Diagonalizing triangular matrices via orthogonal Pierce decompositions. Zbl 1074.15006Hartwig, R. E.; Patrício, P.; Puystjens, R. 3 2005 Determinantal identities over commutative semirings. Zbl 1057.15009Poplin, Phillip L.; Hartwig, Robert E. 24 2004 Some additive results on Drazin inverse. Zbl 0967.15003Hartwig, Robert E.; Wang, Guorong; Wei, Yimin 95 2001 Constrained convergence. Zbl 0930.65032Hartwig, Robert E.; Šemrl, Peter 1 1999 Power additivity and orthogonality. Zbl 0924.15007Hartwig, Robert E.; Šemrl, Peter 1 1998 The group inverse of a companion matrix. Zbl 0890.15003Puystjens, R.; Hartwig, R. E. 40 1997 On products of EP matrices. Zbl 0868.15015Hartwig, Robert E.; Katz, Irving J. 22 1997 Generalized polynomial bases and the Bézoutian. Zbl 0873.15016Mani, Vaidyanath; Hartwig, Robert E. 7 1997 The group inverse of a triangular matrix. Zbl 0851.15005Chen, Xuzhou; Hartwig, Robert E. 17 1996 The hyperpower iteration revisited. Zbl 0848.65021Chen, Xu-Zhou; Hartwig, Robert E. 11 1996 Some properties of the \(q\)-adic Vandermonde matrix. Zbl 0851.15017Mani, Vaidyanath; Hartwig, Robert E. 4 1996 On some characterizations of pairwise star orthogonality using rank and dagger additivity and subtractivity. Zbl 0848.15013Hartwig, Robert E.; Omladič, Matjaž; Šemrl, Peter; Styan, George P. H. 3 1996 Computing the Moore-Penrose inverse for the covariance matrix in constrained nonlinear estimation. Zbl 0874.62069Hartmann, Wolfgang M.; Hartwig, Robert E. 1 1996 Roth’s removal rule and the rational canonical form. Zbl 0861.15010Hartwig, Robert E. 1 1996 Duality and black box interpolation. I: The one variable nonderogatory case. Zbl 0853.15006Mani, Vaidyanath; Hartwig, Robert E. 2 1995 A convexity result for complex numbers with applications to nonnegative normal matrices. Zbl 0823.15019Kirkland, Steve; Hartwig, Robert E. 1 1995 EP perturbations. Zbl 0835.15001Hartwig, Robert E. 3 1994 The weighted \(*\)-core-nilpotent decomposition. Zbl 0813.15002Hartwig, Robert E. 2 1994 Bounds on the exponent of primitivity which depend on the spectrum and the minimal polynomial. Zbl 0790.15016Hartwig, Robert E.; Neumann, Michael 9 1993 On canonical correlations and the degrees of non-orthogonality in the three-way layout. Zbl 0858.62045Bérubé, Julie; Hartwig, Robert E.; Styan, George P. H. 5 1993 The pyramid decomposition and rank minimization. Zbl 0797.15013Hartwig, Robert E. 1 1993 Partial orders based on outer inverses. Zbl 0778.15003Mitra, Sujit Kumar; Hartwig, Robert E. 25 1992 Maximal elements under the three partial orders. Zbl 0767.15017Hartwig, Robert E.; Loewy, Raphael 3 1992 When is a matrix a sum of idempotents? Zbl 0696.15011Hartwig, Robert E.; Putcha, Mohan S. 23 1990 When is a matrix a difference of two idempotents? Zbl 0696.15010Hartwig, Robert E.; Putcha, Mohan S. 15 1990 An algebraic-analytic approach to nonnegative bases. Zbl 0708.15003Hartwig, Robert E.; Neumann, Michael; Rose, Nicholas J. 5 1990 The matrix equation \(A\bar X-AB=C\) and its special cases. Zbl 0655.15013Bevis, Jean H.; Hall, Frank J.; Hartwig, Robert E. 35 1988 Consimilarity and the matrix equation \(A\bar X-XB=C\). Zbl 0655.15012Bevis, Jean H.; Hall, Frank J.; Hartwig, Robert E. 14 1987 The group inverse of a block triangular matrix. Zbl 0661.15003Hartwig, Robert E. 3 1987 A remark on the characterization of the parallel sum of two matrices. Zbl 0638.15003Hartwig, Robert E. 2 1987 A note on light matrices. Zbl 0637.15016Hartwig, Robert E. 2 1987 Pseudo-consimilarity and semi-consimilarity of complex matrices. Zbl 0629.15005Bevis, Jean H.; Hall, Frank J.; Hartwig, Robert E. 2 1987 Resultants, companion matrices, and Jacobson chains. Zbl 0622.15003Hartwig, Robert E. 2 1987 On some characterizations of the ”star” partial ordering for matrices and rank subtractivity. Zbl 0603.15001Hartwig, Robert E.; Styan, George P. H. 60 1986 The reverse order law revisited. Zbl 0584.15002Hartwig, R. E. 47 1986 Block striped and block nested matrices. Zbl 0592.15005Hartwig, R. E.; Hall, F. J.; Katz, I. J. 2 1985 Generalizations of the spectral theorem for matrices. II. Matrix polynomials over arbitrary fields. Zbl 0548.15026Hartwig, R. E. 4 1984 The Drazin inverse as a gradient. Zbl 0562.15001Gabriel, Richard; Hartwig, Robert E. 3 1984 Matrices for which A* and A+ commute. Zbl 0525.15006Hartwig, Robert E.; Spindelboeck, Klaus 45 1983 Partial isometries, contractions and EP matrices. Zbl 0575.15008Hartwig, Robert E.; Spindelböck, Klaus 11 1983 Roth’s removal rule revisited. Zbl 0509.15004Hartwig, Robert E. 9 1983 Some closed form formulae for the intersection of two special matrices under the star order. Zbl 0575.15009Hartwig, Robert E.; Spindelböck, Klaus 5 1983 Pseudo-similarity and partial unit regularity. Zbl 0544.15005Hall, Frank J.; Hartwig, Robert E.; Katz, Irving J.; Newman, Morris 5 1983 Lattice properties of the *-order for complex matrices. Zbl 0485.15014Hartwig, Robert E.; Drazin, Michael P. 25 1982 Applications of the Drazin inverse to Cesaro-Neumann iterations. Zbl 0506.65016Hartwig, R. E.; Hall, F. J. 8 1982 Applications of the Wronskian and Gram matrices of \(\{t^ j \exp(\lambda_ k t)\}\). Zbl 0489.34023Hartwig, Robert E. 5 1982 On a theorem of Flanders. Zbl 0508.15008Hartwig, Robert E. 4 1982 Applications of the Drazin inverse to the Hill cryptographic system. III. Zbl 0491.94015Hartwig, Robert E.; Levine, Jack 22 1981 A method for calculating Drazin inverse of square matrix A. Zbl 0458.15002Hartwig, Robert E. 8 1981 A note on rank-additivity. Zbl 0456.15002Hartwig, Robert E. 8 1981 Semisimilarity for matrices over a division ring. Zbl 0467.15007Hartwig, Robert E.; Putcha, Mohan S. 6 1981 Applications of the Drazin inverse to the Hill cryptographic system. IV. Zbl 0491.94016Hartwig, Robert E.; Levine, Jack 3 1981 Drazin inverses and canonical forms in \(M_ 0(\)Z/h). Zbl 0455.15003Hartwig, Robert E. 2 1981 Algebraic properties of governing matrices used in Cesaro-Neumann iterations. Zbl 0468.65019Hall, Frank J.; Hartwig, Robert E. 1 1981 How to partially order regular elements. Zbl 0442.06006Hartwig, Robert E. 122 1980 Applications of the Drazin inverse to the Hill cryptographic system. I. Zbl 0427.94015Levine, Jack; Hartwig, Robert E. 9 1980 An application of the Moore-Penrose inverse to antisymmetric relations. Zbl 0444.16005Hartwig, Robert E. 4 1980 Applications of the Drazin inverse to the Hill cryptographic system. II. Zbl 0444.94012Levine, Jack; Hartwig, Robert E. 2 1980 Invariance, group inverses and parallel sums. Zbl 0432.16009Hartwig, Robert E.; Shoaf, J. M. 2 1980 On the derivative of the Drazin inverse of a complex matrix. Zbl 0401.15003Hartwig, Robert E.; Shoaf, Jim 7 1979 Pseudo lattice properties of the star-orthogonal partial ordering for star-regular rings. Zbl 0423.06013Hartwig, Robert E. 4 1979 Theory and applications of matrix perturbations, with respect to Hankel matrices and power formulae. Zbl 0401.93021Hartwig, Robert E. 2 1979 A note on the partial ordering of positive semi-definite matrices. Zbl 0408.15015Hartwig, Robert E. 18 1978 Pseudo-similarity for matrices over a field. Zbl 0386.15013Hartwig, R. E.; Hall, F. J. 6 1978 Generalized inverses, EP elements and associates. Zbl 0376.16012Hartwig, Robert E. 5 1978 Schur’s theorem and the Drazin inverse. Zbl 0362.15003Hartwig, Robert E. 3 1978 A note on pseudo-similarity of matrices. Zbl 0398.15009Hall, Frank J.; Hartwig, Robert E.; Katz, Irving J. 2 1978 Spectral inverses and the row-space equations. Zbl 0388.15002Hartwig, Robert E. 2 1978 A note on the existence of inner and outer inverses. Zbl 0396.16006Hartwig, Robert E. 1 1978 Group inverses and Drazin inverses of bidiagonal and triangular Toeplitz matrices. Zbl 0372.15003Hartwig, R. E.; Shoaf, J. 53 1977 A note on the group structure of unit regular ring elements. Zbl 0355.16005Hartwig, Robert E.; Luh, Jiang 29 1977 A note on periodic matrices. Zbl 0391.15004Hartwig, Robert E. 2 1977 Block generalized inverses. Zbl 0335.15004Hartwig, Robert E. 62 1976 More on the Souriau-Frame algorithm and the Drazin inverse. Zbl 0335.15008Hartwig, R. E. 26 1976 Singular value decomposition and the Moore-Penrose inverse of bordered matrices. Zbl 0335.15006Hartwig, Robert E. 18 1976 Roth’s equivalence problem in unit regular rings. Zbl 0347.15005Hartwig, Robert E. 14 1976 On finite regular rings. Zbl 0326.16012Hartwig, Robert E.; Luh, Jiang 11 1976 Further results on generalized inverses of partitioned matrices. Zbl 0345.15005Hall, Frank J.; Hartwig, Robert E. 9 1976 Rank factorization and Moore-Penrose inversion. Zbl 0335.15005Hartwig, Robert E. 7 1976 The generalized faro shuffle. Zbl 0334.05034Morris, S. Brent; Hartwig, Robert E. 4 1976 Products of EP elements in reflexive semigroups. Zbl 0329.20052Hartwig, Robert E.; Katz, Irving J. 1 1976 1-2 inverses and the invariance of \(BA^+C\). Zbl 0312.15001Hartwig, Robert E. 12 1975 The universal flip matrix and the generalized faro-shuffle. Zbl 0316.15013Hartwig, Robert E.; Morris, S. Brent 6 1975 AX-XB=C, resultants and generalized inverses. Zbl 0268.15004Hartwig, Robert E. 4 1975 Resultants and the solution of AX - XB = - C. Zbl 0222.15007Hartwig, Robert E. 22 1972 The resultant and the matrix equation AX = XB. Zbl 0243.15008Hartwig, Robert E. 6 1972 ...and 3 more Documents all cited Publications top 5 cited Publications all top 5 Cited by 678 Authors 50 Hartwig, Robert E. 43 Mosić, Dijana 43 Wei, Yimin 39 Chen, Jianlong 31 Đorđević, Dragan S. 30 Liu, Xiaoji 30 Patrício, Pedro 28 Cvetković-Ilić, Dragana S. 28 Deng, Chunyuan 21 Baksalary, Jerzy K. 21 Tian, Yongge 16 Baksalary, Oskar Maria 16 Wu, Aiguo 15 Duan, Guangren 15 Trenkler, Götz 13 Bu, Changjiang 13 Gross, Jürgen 13 Mitra, Sujit Kumar 13 Thome, Néstor 12 Marovt, Janko 11 Benítez Lopez, Julio 10 Guterman, Alexander Èmilevich 10 Wang, Qingwen 9 Castro González, Nieves 9 Chen, Huanyin 9 Li, Tingting 9 Mary, Xavier 9 Puystjens, Roland 9 Styan, George P. H. 9 Wang, Hongxing 9 Zhu, Huihui 8 Cao, Chongguang 8 Shu, Qianyu 8 Song, Chuanning 8 Wang, Xueping 8 Xiong, Zhiping 8 Xu, Qingxiang 7 Chen, Guoliang 7 Hall, Frank J. 7 Hauke, Jan 7 Martínez-Serrano, M. F. 7 Stanimirović, Predrag S. 7 Xu, Sanzhang 7 Xu, Zhaoliang 7 Yu, Yaoming 7 Zhou, Mengmeng 7 Zou, Honglin 6 Bart, Harm 6 Chen, Jianbiao 6 Ehrhardt, Torsten 6 Ma, Haifeng 6 Neumann, Michael 6 Silbermann, Bernd 6 Tan, Yijia 6 Wang, Guorong 6 Wang, Jin-Hsien 5 Dinčić, Nebojša Č. 5 Djikić, Marko S. 5 Efimov, Mikhail A. 5 Feng, Gang 5 Gao, Yuefeng 5 Ke, Yuanyuan 5 Rakić, Dragan S. 5 Šemrl, Peter 5 Sheng, Xingping 5 Sivakumar, Koratti Chengalrayan 5 Wu, Weijun 5 Yu, Anqi 4 Chen, Xuzhou 4 Dopazo, Esther 4 Du, Hongke 4 Ferreyra, David E. 4 Ge, Yanling 4 Guralnick, Robert Michael 4 Jain, Surender Kumar 4 Jin, Hongwei 4 Karizaki, Mehdi Mohammadzadeh 4 Koliha, Jerry J. 4 Lam, Tsit-Yuen 4 Lešnjak, Gorazd 4 Liu, Wanquan 4 Lv, Lingling 4 Malik, Saroj B. 4 Markiewicz, Augustyn 4 Nielsen, Pace P. 4 Prasad, K. Manjunatha 4 Qin, Yingying 4 Sheibani Abdolyousefi, Marjan 4 Wei, Musheng 4 Widom, Harold 4 Yang, Zhenghong 4 Zhang, Hanyu 4 Zhang, Kuize 4 Zhang, Xiaoxiang 4 Zhou, Bin 4 Zhou, Jiang 4 Zuo, Kezheng 3 Bevis, Jean H. 3 Boasso, Enrico 3 Böttcher, Albrecht ...and 578 more Authors all top 5 Cited in 144 Serials 266 Linear Algebra and its Applications 97 Linear and Multilinear Algebra 97 Applied Mathematics and Computation 28 Journal of Mathematical Analysis and Applications 14 Communications in Algebra 14 Journal of Algebra and its Applications 12 Journal of Computational and Applied Mathematics 12 Journal of Applied Mathematics and Computing 10 Aequationes Mathematicae 9 Computers & Mathematics with Applications 9 Semigroup Forum 9 Journal of Mathematical Sciences (New York) 9 Bulletin of the Malaysian Mathematical Sciences Society. Second Series 9 Frontiers of Mathematics in China 7 Proceedings of the American Mathematical Society 7 Journal of the Australian Mathematical Society 7 Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales. Serie A: Matemáticas. RACSAM 6 Czechoslovak Mathematical Journal 6 Computational and Applied Mathematics 5 Journal of Algebra 5 Mathematical and Computer Modelling 5 International Journal of Computer Mathematics 5 Turkish Journal of Mathematics 5 Journal of Applied Mathematics 5 Mediterranean Journal of Mathematics 4 Mathematical Notes 4 Numerical Functional Analysis and Optimization 4 ELA. The Electronic Journal of Linear Algebra 3 Communications in Mathematical Physics 3 Indian Journal of Pure & Applied Mathematics 3 Journal of the Franklin Institute 3 Nuclear Physics. B 3 Ukrainian Mathematical Journal 3 Integral Equations and Operator Theory 3 Quaestiones Mathematicae 3 Transactions of the American Mathematical Society 3 Advances in Applied Clifford Algebras 3 Abstract and Applied Analysis 3 Journal of Inequalities and Applications 3 Complex Analysis and Operator Theory 3 Operators and Matrices 3 Banach Journal of Mathematical Analysis 3 Functional Analysis, Approximation and Computation 3 Open Mathematics 2 Archive for Rational Mechanics and Analysis 2 Bulletin of the Australian Mathematical Society 2 International Journal of Systems Science 2 Rocky Mountain Journal of Mathematics 2 Computing 2 Glasgow Mathematical Journal 2 International Journal of Mathematics and Mathematical Sciences 2 Journal of Pure and Applied Algebra 2 Rendiconti del Circolo Matemàtico di Palermo. Serie II 2 Advances in Applied Mathematics 2 Bulletin of the Iranian Mathematical Society 2 Communications in Statistics. Theory and Methods 2 Algebra Colloquium 2 Mathematical Problems in Engineering 2 Soft Computing 2 Acta Mathematica Sinica. English Series 2 Central European Journal of Mathematics 2 International Journal of Applied and Computational Mathematics 1 The Canadian Journal of Statistics 1 Communications on Pure and Applied Mathematics 1 Discrete Applied Mathematics 1 Discrete Mathematics 1 International Journal of Mathematical Education in Science and Technology 1 Journal of Mathematical Physics 1 Journal of Statistical Physics 1 Mathematical Proceedings of the Cambridge Philosophical Society 1 Moscow University Mathematics Bulletin 1 Periodica Mathematica Hungarica 1 Mathematics of Computation 1 Algebra Universalis 1 Annals of the Institute of Statistical Mathematics 1 Annali di Matematica Pura ed Applicata. Serie Quarta 1 Annales Universitatis Mariae Curie-Skłodowska. Sectio A. Mathematica 1 BIT 1 Calcolo 1 Functional Analysis and its Applications 1 Information Sciences 1 Publications Mathématiques 1 Journal of Functional Analysis 1 Journal of Soviet Mathematics 1 Journal of Statistical Planning and Inference 1 Kybernetika 1 Mathematica Slovaca 1 Monatshefte für Mathematik 1 Numerische Mathematik 1 Results in Mathematics 1 Revista de la Unión Matemática Argentina 1 Theoretical Computer Science 1 Cryptologia 1 SIAM Journal on Algebraic and Discrete Methods 1 Circuits, Systems, and Signal Processing 1 Applied Mathematics and Mechanics. (English Edition) 1 Chinese Annals of Mathematics. Series B 1 Acta Mathematica Hungarica 1 Acta Mathematicae Applicatae Sinica. English Series 1 Statistics ...and 44 more Serials all top 5 Cited in 42 Fields 673 Linear and multilinear algebra; matrix theory (15-XX) 166 Operator theory (47-XX) 149 Associative rings and algebras (16-XX) 100 Numerical analysis (65-XX) 68 Order, lattices, ordered algebraic structures (06-XX) 63 Functional analysis (46-XX) 35 Group theory and generalizations (20-XX) 22 Combinatorics (05-XX) 14 Systems theory; control (93-XX) 12 Statistics (62-XX) 9 \(K\)-theory (19-XX) 9 Ordinary differential equations (34-XX) 9 Operations research, mathematical programming (90-XX) 7 Category theory; homological algebra (18-XX) 7 Computer science (68-XX) 5 Number theory (11-XX) 5 Quantum theory (81-XX) 5 Statistical mechanics, structure of matter (82-XX) 4 History and biography (01-XX) 4 Commutative algebra (13-XX) 4 Information and communication theory, circuits (94-XX) 3 Functions of a complex variable (30-XX) 3 Approximations and expansions (41-XX) 3 Probability theory and stochastic processes (60-XX) 2 Field theory and polynomials (12-XX) 2 Nonassociative rings and algebras (17-XX) 2 Several complex variables and analytic spaces (32-XX) 2 Integral transforms, operational calculus (44-XX) 2 Integral equations (45-XX) 2 Convex and discrete geometry (52-XX) 1 General and overarching topics; collections (00-XX) 1 Mathematical logic and foundations (03-XX) 1 Algebraic geometry (14-XX) 1 Measure and integration (28-XX) 1 Special functions (33-XX) 1 Difference and functional equations (39-XX) 1 Sequences, series, summability (40-XX) 1 Harmonic analysis on Euclidean spaces (42-XX) 1 Differential geometry (53-XX) 1 Mechanics of deformable solids (74-XX) 1 Game theory, economics, finance, and other social and behavioral sciences (91-XX) 1 Biology and other natural sciences (92-XX) Citations by Year