Castro-González, Nieves; Hartwig, Robert E. Perturbation results and the forward order law for the Moore-Penrose inverse of a product. (English) Zbl 1405.15007 Electron. J. Linear Algebra 34, 514-525 (2018). MSC: 15A09 15A23 15A24 PDFBibTeX XMLCite \textit{N. Castro-González} and \textit{R. E. Hartwig}, Electron. J. Linear Algebra 34, 514--525 (2018; Zbl 1405.15007)
Hartwig, R. E.; Patrício, P. The group inverse of the nivellateur. (English) Zbl 1400.15008 Linear Multilinear Algebra 66, No. 12, 2409-2420 (2018). MSC: 15A09 15A21 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{P. Patrício}, Linear Multilinear Algebra 66, No. 12, 2409--2420 (2018; Zbl 1400.15008) Full Text: DOI Link
Hartwig, R. E.; Patrício, P. Invariance under outer inverses. (English) Zbl 1390.15011 Aequationes Math. 92, No. 2, 375-383 (2018). MSC: 15A09 16E50 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{P. Patrício}, Aequationes Math. 92, No. 2, 375--383 (2018; Zbl 1390.15011) Full Text: DOI Link
Patrício, P.; Hartwig, R. E. Some regular sums. (English) Zbl 1307.15008 Linear Multilinear Algebra 63, No. 1, 185-200 (2015). Reviewer: Mohammad Sal Moslehian (Mashhad) MSC: 15A09 16E50 PDFBibTeX XMLCite \textit{P. Patrício} and \textit{R. E. Hartwig}, Linear Multilinear Algebra 63, No. 1, 185--200 (2015; Zbl 1307.15008) Full Text: DOI Link
Hartwig, R. E.; Patrício, P. Two by two units. (English) Zbl 1327.15004 Electron. J. Linear Algebra 27, 489-503 (2014). MSC: 15A09 15B33 16E50 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{P. Patrício}, Electron. J. Linear Algebra 27, 489--503 (2014; Zbl 1327.15004) Full Text: DOI Link
Patrício, P.; Hartwig, R. E. The \((2,2,0)\) Drazin inverse problem. (English) Zbl 1261.15008 Linear Algebra Appl. 437, No. 11, 2755-2772 (2012). Reviewer: Chen Sheng (Harbin) MSC: 15A09 PDFBibTeX XMLCite \textit{P. Patrício} and \textit{R. E. Hartwig}, Linear Algebra Appl. 437, No. 11, 2755--2772 (2012; Zbl 1261.15008) Full Text: DOI
Hartwig, R. E.; Patricio, P. A note on power bounded matrices. (English) Zbl 1251.15016 Electron. J. Linear Algebra 23, 625-645 (2012). MSC: 15A21 15B48 15B57 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{P. Patricio}, Electron. J. Linear Algebra 23, 625--645 (2012; Zbl 1251.15016) Full Text: DOI Link Link
Hartwig, R. E.; Patrício, P. When does the Moore-Penrose inverse flip? (English) Zbl 1241.15004 Oper. Matrices 6, No. 1, Article ID 13, 181-192 (2012). MSC: 15A09 15B33 16E50 16W10 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{P. Patrício}, Oper. Matrices 6, No. 1, Article ID 13, 181--192 (2012; Zbl 1241.15004) Full Text: Link
Patrício, Pedro; Hartwig, R. E. The link between regularity and strong-pi-regularity. (English) Zbl 1204.15015 J. Aust. Math. Soc. 89, No. 1, 17-22 (2010). Reviewer: Juan Ramon Torregrosa Sanchez (Valencia) MSC: 15A09 15A24 16E50 15B33 PDFBibTeX XMLCite \textit{P. Patrício} and \textit{R. E. Hartwig}, J. Aust. Math. Soc. 89, No. 1, 17--22 (2010; Zbl 1204.15015) Full Text: DOI
Patrício, P.; Hartwig, R. E. The \((2,2,0)\) group inverse problem. (English) Zbl 1204.15014 Appl. Math. Comput. 217, No. 2, 516-520 (2010). Reviewer: Juan Ramon Torregrosa Sanchez (Valencia) MSC: 15A09 15A23 15A24 PDFBibTeX XMLCite \textit{P. Patrício} and \textit{R. E. Hartwig}, Appl. Math. Comput. 217, No. 2, 516--520 (2010; Zbl 1204.15014) Full Text: DOI Link
Patrício, P.; Hartwig, R. E. Some additive results on Drazin inverses. (English) Zbl 1182.65067 Appl. Math. Comput. 215, No. 2, 530-538 (2009). Reviewer: Nestor Thome (Valencia) MSC: 65F20 15A09 PDFBibTeX XMLCite \textit{P. Patrício} and \textit{R. E. Hartwig}, Appl. Math. Comput. 215, No. 2, 530--538 (2009; Zbl 1182.65067) Full Text: DOI Link
Hartwig, R. E.; Patricio, Pedro On Roth’s pseudo equivalence over rings. (English) Zbl 1158.15009 Electron. J. Linear Algebra 16, 111-124 (2007). Reviewer: Gábor Braun (Budapest) MSC: 15A24 16E50 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{P. Patricio}, Electron. J. Linear Algebra 16, 111--124 (2007; Zbl 1158.15009) Full Text: DOI EuDML Link
Chen, Xuzhou; Hartwig, Robert E. The Picard iteration and its application. (English) Zbl 1103.65034 Linear Multilinear Algebra 54, No. 5, 329-341 (2006). Reviewer: Nicholas Karampetakis (Thessaloniki) MSC: 65F10 15A21 15A18 15A09 15B57 PDFBibTeX XMLCite \textit{X. Chen} and \textit{R. E. Hartwig}, Linear Multilinear Algebra 54, No. 5, 329--341 (2006; Zbl 1103.65034) Full Text: DOI
Hartwig, Robert; Li, Xiezhang; Wei, Yimin Representations for the Drazin inverse of a \(2 \times 2\) block matrix. (English) Zbl 1100.15003 SIAM J. Matrix Anal. Appl. 27, No. 3, 757-771 (2006). Reviewer: Nestor Thome (Valencia) MSC: 15A09 65F20 PDFBibTeX XMLCite \textit{R. Hartwig} et al., SIAM J. Matrix Anal. Appl. 27, No. 3, 757--771 (2006; Zbl 1100.15003) Full Text: DOI
Hartwig, R. E.; Patrício, P.; Puystjens, R. Diagonalizing triangular matrices via orthogonal Pierce decompositions. (English) Zbl 1074.15006 Linear Algebra Appl. 401, 381-391 (2005). Reviewer: Mihail Voicu (Iaşi) MSC: 15A09 15A21 PDFBibTeX XMLCite \textit{R. E. Hartwig} et al., Linear Algebra Appl. 401, 381--391 (2005; Zbl 1074.15006) Full Text: DOI Link
Hartwig, Robert E.; Maroulas, John Focal power. (English) Zbl 1066.15015 Electron. J. Linear Algebra 13, 56-71 (2005). Reviewer: Vladimir P. Kostov (Nice) MSC: 15A24 15A09 15B57 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{J. Maroulas}, Electron. J. Linear Algebra 13, 56--71 (2005; Zbl 1066.15015) Full Text: DOI EuDML EMIS Link
Poplin, Phillip L.; Hartwig, Robert E. Determinantal identities over commutative semirings. (English) Zbl 1057.15009 Linear Algebra Appl. 387, 99-132 (2004). Reviewer: Nikolai I. Osetinski (Moskva) MSC: 15A15 15A24 15B33 16S50 PDFBibTeX XMLCite \textit{P. L. Poplin} and \textit{R. E. Hartwig}, Linear Algebra Appl. 387, 99--132 (2004; Zbl 1057.15009) Full Text: DOI
Hartwig, Robert E.; Wang, Guorong; Wei, Yimin Some additive results on Drazin inverse. (English) Zbl 0967.15003 Linear Algebra Appl. 322, No. 1-3, 207-217 (2001). Reviewer: Václav Burjan (Praha) MSC: 15A09 15A23 PDFBibTeX XMLCite \textit{R. E. Hartwig} et al., Linear Algebra Appl. 322, No. 1--3, 207--217 (2001; Zbl 0967.15003) Full Text: DOI
Hartwig, Robert E.; Prasad, K. M. Creation and annihilation in matrix theory. (English) Zbl 0946.15006 Linear Algebra Appl. 305, No. 1-3, 47-65 (2000). Reviewer: Y.Kuo (Knoxville) MSC: 15A21 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{K. M. Prasad}, Linear Algebra Appl. 305, No. 1--3, 47--65 (2000; Zbl 0946.15006) Full Text: DOI
Hartwig, Robert E.; Šemrl, Peter Power additivity and orthogonality. (English) Zbl 0924.15007 SIAM J. Matrix Anal. Appl. 20, No. 1, 1-13 (1998). Reviewer: J.D.Dixon (Ottawa) MSC: 15A21 15A24 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{P. Šemrl}, SIAM J. Matrix Anal. Appl. 20, No. 1, 1--13 (1998; Zbl 0924.15007) Full Text: DOI
Hartwig, Robert E.; Katz, Irving J. On products of EP matrices. (English) Zbl 0868.15015 Linear Algebra Appl. 252, 339-345 (1997). Reviewer: Y.Kuo (Knoxville) MSC: 15B57 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{I. J. Katz}, Linear Algebra Appl. 252, 339--345 (1997; Zbl 0868.15015) Full Text: DOI
Mani, Vaidyanath; Hartwig, Robert E. Generalized polynomial bases and the Bézoutian. (English) Zbl 0873.15016 Linear Algebra Appl. 251, 293-320 (1997). Reviewer: G.E.Wall (Sydney) MSC: 15B57 93B25 15A21 PDFBibTeX XMLCite \textit{V. Mani} and \textit{R. E. Hartwig}, Linear Algebra Appl. 251, 293--320 (1997; Zbl 0873.15016) Full Text: DOI
Puystjens, R.; Hartwig, R. E. The group inverse of a companion matrix. (English) Zbl 0890.15003 Linear Multilinear Algebra 43, No. 1-3, 137-150 (1997). Reviewer: A.K.Lal (Kanpur) MSC: 15A09 34A30 65F20 15A06 PDFBibTeX XMLCite \textit{R. Puystjens} and \textit{R. E. Hartwig}, Linear Multilinear Algebra 43, No. 1--3, 137--150 (1997; Zbl 0890.15003) Full Text: DOI
Mani, Vaidyanath; Hartwig, Robert E. Black box interpolation. II: The one variable derogatory case. (English) Zbl 1141.15315 Linear Algebra Appl. 249, 229-253 (1996). MSC: 15A21 15A15 41A05 PDFBibTeX XMLCite \textit{V. Mani} and \textit{R. E. Hartwig}, Linear Algebra Appl. 249, 229--253 (1996; Zbl 1141.15315) Full Text: DOI
Hartmann, Wolfgang M.; Hartwig, Robert E. Computing the Moore-Penrose inverse for the covariance matrix in constrained nonlinear estimation. (English) Zbl 0874.62069 SIAM J. Optim. 6, No. 3, 727-747 (1996). MSC: 62H99 15A09 65C99 62H12 PDFBibTeX XMLCite \textit{W. M. Hartmann} and \textit{R. E. Hartwig}, SIAM J. Optim. 6, No. 3, 727--747 (1996; Zbl 0874.62069) Full Text: DOI
Hartwig, Robert E. Roth’s removal rule and the rational canonical form. (English) Zbl 0861.15010 Am. Math. Mon. 103, No. 4, 332-335 (1996). Reviewer: M.-Y.Wu (Boulder) MSC: 15A21 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Am. Math. Mon. 103, No. 4, 332--335 (1996; Zbl 0861.15010) Full Text: DOI
Mani, Vaidyanath; Hartwig, Robert E. Some properties of the \(q\)-adic Vandermonde matrix. (English) Zbl 0851.15017 Electron. J. Linear Algebra 1, 18-33 (1996). Reviewer: V.Burjan (Praha) MSC: 15B57 15A15 15A21 41A10 12Y05 PDFBibTeX XML Full Text: EuDML EMIS
Hartwig, Robert E.; Omladič, Matjaž; Šemrl, Peter; Styan, George P. H. On some characterizations of pairwise star orthogonality using rank and dagger additivity and subtractivity. (English) Zbl 0848.15013 Linear Algebra Appl. 237-238, 499-507 (1996). Reviewer: G.Bonanno (Davis) MSC: 15A30 PDFBibTeX XMLCite \textit{R. E. Hartwig} et al., Linear Algebra Appl. 237--238, 499--507 (1996; Zbl 0848.15013) Full Text: DOI
Chen, Xuzhou; Hartwig, Robert E. The group inverse of a triangular matrix. (English) Zbl 0851.15005 Linear Algebra Appl. 237-238, 97-108 (1996). Reviewer: J.D.Dixon (Ottawa) MSC: 15A09 PDFBibTeX XMLCite \textit{X. Chen} and \textit{R. E. Hartwig}, Linear Algebra Appl. 237--238, 97--108 (1996; Zbl 0851.15005) Full Text: DOI
Barnett, S.; Hartwig, R. E. Special rank-one perturbations. (English) Zbl 0855.15005 Linear Algebra Appl. 235, 171-190 (1996). Reviewer: Costică Moroşanu (Iaşi) MSC: 15A21 93B05 PDFBibTeX XMLCite \textit{S. Barnett} and \textit{R. E. Hartwig}, Linear Algebra Appl. 235, 171--190 (1996; Zbl 0855.15005) Full Text: DOI
Chen, Xu-Zhou; Hartwig, Robert E. The hyperpower iteration revisited. (English) Zbl 0848.65021 Linear Algebra Appl. 233, 207-229 (1996). Reviewer: A.Swift (Palmerston North) MSC: 65F20 65F10 15A09 PDFBibTeX XMLCite \textit{X.-Z. Chen} and \textit{R. E. Hartwig}, Linear Algebra Appl. 233, 207--229 (1996; Zbl 0848.65021) Full Text: DOI
Kirkland, Steve; Hartwig, Robert E. A convexity result for complex numbers with applications to nonnegative normal matrices. (English) Zbl 0823.15019 Linear Algebra Appl. 221, 195-204 (1995). Reviewer: Li Shaokuan (Shanghai) MSC: 15B48 PDFBibTeX XMLCite \textit{S. Kirkland} and \textit{R. E. Hartwig}, Linear Algebra Appl. 221, 195--204 (1995; Zbl 0823.15019) Full Text: DOI
Mani, Vaidyanath; Hartwig, Robert E. Duality and black box interpolation. I: The one variable nonderogatory case. (English) Zbl 0853.15006 SIAM J. Matrix Anal. Appl. 16, No. 1, 21-28 (1995). Reviewer: Á.G.Horváth (Budapest) MSC: 15A21 15A15 41A05 PDFBibTeX XMLCite \textit{V. Mani} and \textit{R. E. Hartwig}, SIAM J. Matrix Anal. Appl. 16, No. 1, 21--28 (1995; Zbl 0853.15006) Full Text: DOI
Hartwig, Robert E. EP perturbations. (English) Zbl 0835.15001 Sankhyā, Ser. A 56, No. 2, 347-357 (1994). MSC: 15A09 15A24 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Sankhyā, Ser. A 56, No. 2, 347--357 (1994; Zbl 0835.15001)
Hartwig, Robert E. The weighted \(*\)-core-nilpotent decomposition. (English) Zbl 0813.15002 Linear Algebra Appl. 211, 101-111 (1994). Reviewer: S.L.Campbell (Raleigh) MSC: 15A09 15A23 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Linear Algebra Appl. 211, 101--111 (1994; Zbl 0813.15002) Full Text: DOI
Bapat, Ravi (ed.); Mitra, Sujit Kumar (ed.); Hartwig, Robert (ed.) Generalized inverses. Proceedings of a workshop, held 11-16 December 1993, New Delhi, India. Linear Algebra and its Applications 211. Linear Algebra and its Applications 211. (English) Zbl 0799.00011 Amsterdam: North-Holland, 113 p. (1994). MSC: 00B15 15A09 15-06 PDFBibTeX XMLCite \textit{R. Bapat} (ed.) et al., Generalized inverses. Proceedings of a workshop, held 11-16 December 1993, New Delhi, India. Linear Algebra and its Applications 211. \newline Linear Algebra and its Applications 211. Amsterdam: North-Holland (1994; Zbl 0799.00011)
Bérubé, Julie; Hartwig, Robert E.; Styan, George P. H. On canonical correlations and the degrees of non-orthogonality in the three-way layout. (English) Zbl 0858.62045 Matsusita, K. (ed.) et al., Statistical sciences and data analysis. Proceedings of the third Pacific Area statistical conference, Makuhari, Japan, December 11-13, 1991. Utrecht: VSP. 247-252 (1993). MSC: 62H20 15A99 62K99 PDFBibTeX XMLCite \textit{J. Bérubé} et al., in: Statistical sciences and data analysis. Proceedings of the third Pacific Area statistical conference, Makuhari, Japan, December 11-13, 1991. Utrecht: VSP. 247--252 (1993; Zbl 0858.62045)
Hartwig, Robert E. The pyramid decomposition and rank minimization. (English) Zbl 0797.15013 Linear Algebra Appl. 191, 53-76 (1993). Reviewer: J.Zemánek (Warszawa) MSC: 15B33 15A09 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Linear Algebra Appl. 191, 53--76 (1993; Zbl 0797.15013) Full Text: DOI
Hartwig, Robert E.; Neumann, Michael Bounds on the exponent of primitivity which depend on the spectrum and the minimal polynomial. (English) Zbl 0790.15016 Linear Algebra Appl. 184, 103-122 (1993). Reviewer: T.Nôno (Hiroshima) MSC: 15B48 15A21 05C50 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{M. Neumann}, Linear Algebra Appl. 184, 103--122 (1993; Zbl 0790.15016) Full Text: DOI
Mitra, Sujit Kumar; Hartwig, Robert E. Partial orders based on outer inverses. (English) Zbl 0778.15003 Linear Algebra Appl. 176, 3-20 (1992). Reviewer: S.L.Campbell (Raleigh) MSC: 15A09 15B48 06F25 PDFBibTeX XMLCite \textit{S. K. Mitra} and \textit{R. E. Hartwig}, Linear Algebra Appl. 176, 3--20 (1992; Zbl 0778.15003) Full Text: DOI
Hartwig, Robert E.; Loewy, Raphael Maximal elements under the three partial orders. (English) Zbl 0767.15017 Linear Algebra Appl. 175, 39-61 (1992). Reviewer: J.M.Day (San José) MSC: 15A60 15A45 06F25 47L07 46A40 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{R. Loewy}, Linear Algebra Appl. 175, 39--61 (1992; Zbl 0767.15017) Full Text: DOI
Hartwig, Robert E.; Neumann, Michael; Rose, Nicholas J. An algebraic-analytic approach to nonnegative bases. (English) Zbl 0708.15003 Linear Algebra Appl. 133, 77-88 (1990). Reviewer: L.Mihalyffy MSC: 15A18 15B48 PDFBibTeX XMLCite \textit{R. E. Hartwig} et al., Linear Algebra Appl. 133, 77--88 (1990; Zbl 0708.15003) Full Text: DOI
Bevis, Jean H.; Hall, Frank J.; Hartwig, Robert E. Conpseudosimilarity and consemisimilarity over a division ring. (English) Zbl 0701.15005 Linear Algebra Appl. 136, 181-188 (1990). Reviewer: W.Wiȩsław (Wrocław) MSC: 15A21 15B33 PDFBibTeX XMLCite \textit{J. H. Bevis} et al., Linear Algebra Appl. 136, 181--188 (1990; Zbl 0701.15005) Full Text: DOI
Hartwig, Robert E.; Putcha, Mohan S. When is a matrix a sum of idempotents? (English) Zbl 0696.15011 Linear Multilinear Algebra 26, No. 4, 279-286 (1990). Reviewer: F.J.Gaines MSC: 15A21 15B36 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{M. S. Putcha}, Linear Multilinear Algebra 26, No. 4, 279--286 (1990; Zbl 0696.15011) Full Text: DOI
Hartwig, Robert E.; Putcha, Mohan S. When is a matrix a difference of two idempotents? (English) Zbl 0696.15010 Linear Multilinear Algebra 26, No. 4, 267-277 (1990). Reviewer: F.J.Gaines MSC: 15A21 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{M. S. Putcha}, Linear Multilinear Algebra 26, No. 4, 267--277 (1990; Zbl 0696.15010) Full Text: DOI
Bevis, Jean H.; Hall, Frank J.; Hartwig, Robert E. The matrix equation \(A\bar X-AB=C\) and its special cases. (English) Zbl 0655.15013 SIAM J. Matrix Anal. Appl. 9, No. 3, 348-359 (1988). Reviewer: J.de Graaf MSC: 15A24 PDFBibTeX XMLCite \textit{J. H. Bevis} et al., SIAM J. Matrix Anal. Appl. 9, No. 3, 348--359 (1988; Zbl 0655.15013) Full Text: DOI
Hartwig, Robert E. The group inverse of a block triangular matrix. (English) Zbl 0661.15003 Current trends in matrix theory, Proc. 3rd Conf., Auburn/Ala. 1986, 137-146 (1987). Reviewer: S.L.Campbell MSC: 15A09 PDFBibTeX XML
Bevis, Jean H.; Hall, Frank J.; Hartwig, Robert E. Consimilarity and the matrix equation \(A\bar X-XB=C\). (English) Zbl 0655.15012 Current trends in matrix theory, Proc. 3rd Conf., Auburn/Ala. 1986, 51-64 (1987). Reviewer: J.de Graaf MSC: 15A24 PDFBibTeX XML
Hartwig, Robert E. A remark on the characterization of the parallel sum of two matrices. (English) Zbl 0638.15003 Linear Multilinear Algebra 22, No. 2, 193-197 (1987). Reviewer: P.Rudra MSC: 15A09 15B33 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Linear Multilinear Algebra 22, No. 2, 193--197 (1987; Zbl 0638.15003) Full Text: DOI
Hartwig, Robert E. A note on light matrices. (English) Zbl 0637.15016 Linear Algebra Appl. 97, 153-169 (1987). Reviewer: Eugene Seneta (Sydney) MSC: 15B48 15A45 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Linear Algebra Appl. 97, 153--169 (1987; Zbl 0637.15016) Full Text: DOI
Bevis, Jean H.; Hall, Frank J.; Hartwig, Robert E. The Drazin inverse of a semilinear transformation and its matrix representation. (English) Zbl 0632.15002 Linear Algebra Appl. 97, 229-242 (1987). Reviewer: S.L.Campbell MSC: 15A09 15A04 PDFBibTeX XMLCite \textit{J. H. Bevis} et al., Linear Algebra Appl. 97, 229--242 (1987; Zbl 0632.15002) Full Text: DOI
Bevis, Jean H.; Hall, Frank J.; Hartwig, Robert E. Pseudo-consimilarity and semi-consimilarity of complex matrices. (English) Zbl 0629.15005 Linear Algebra Appl. 90, 73-80 (1987). Reviewer: P.Rudra MSC: 15A21 PDFBibTeX XMLCite \textit{J. H. Bevis} et al., Linear Algebra Appl. 90, 73--80 (1987; Zbl 0629.15005) Full Text: DOI
Hartwig, Robert E. Resultants, companion matrices, and Jacobson chains. (English) Zbl 0622.15003 Linear Algebra Appl. 94, 1-34 (1987). Reviewer: Tong Wenting MSC: 15A21 15A15 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Linear Algebra Appl. 94, 1--34 (1987; Zbl 0622.15003) Full Text: DOI
Hartwig, Robert E.; Styan, George P. H. On some characterizations of the ”star” partial ordering for matrices and rank subtractivity. (English) Zbl 0603.15001 Linear Algebra Appl. 82, 145-161 (1986). Reviewer: S.L.Campbell MSC: 15A09 06F25 15A03 15A18 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{G. P. H. Styan}, Linear Algebra Appl. 82, 145--161 (1986; Zbl 0603.15001) Full Text: DOI
Hartwig, R. E. The reverse order law revisited. (English) Zbl 0584.15002 Linear Algebra Appl. 76, 241-246 (1986). Reviewer: H.-J.Kowalsky MSC: 15A09 15A24 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Linear Algebra Appl. 76, 241--246 (1986; Zbl 0584.15002) Full Text: DOI
Hartwig, R. E.; Hall, F. J.; Katz, I. J. Block striped and block nested matrices. (English) Zbl 0592.15005 Linear algebra and its role in systems theory, Proc. AMS-IMS-SIAM Conf., Brunswick/Maine 1984, Contemp. Math. 47, 177-201 (1985). Reviewer: L.Bakule MSC: 15A24 15B57 15A27 15A06 93B17 PDFBibTeX XML
Gabriel, Richard; Hartwig, Robert E. The Drazin inverse as a gradient. (English) Zbl 0562.15001 Linear Algebra Appl. 63, 237-252 (1984). Reviewer: S.L.Campbell MSC: 15A09 15A15 15A24 15A60 PDFBibTeX XMLCite \textit{R. Gabriel} and \textit{R. E. Hartwig}, Linear Algebra Appl. 63, 237--252 (1984; Zbl 0562.15001) Full Text: DOI
Hartwig, R. E. Generalizations of the spectral theorem for matrices. II. Matrix polynomials over arbitrary fields. (English) Zbl 0548.15026 Linear Algebra Appl. 61, 37-53 (1984). MSC: 15A60 15A18 15A09 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Linear Algebra Appl. 61, 37--53 (1984; Zbl 0548.15026) Full Text: DOI
Hartwig, Robert E.; Spindelböck, Klaus Some closed form formulae for the intersection of two special matrices under the star order. (English) Zbl 0575.15009 Linear Multilinear Algebra 13, 323-331 (1983). Reviewer: F.J.Gaines MSC: 15B57 15A09 06A12 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{K. Spindelböck}, Linear Multilinear Algebra 13, 323--331 (1983; Zbl 0575.15009) Full Text: DOI
Hartwig, Robert E.; Spindelböck, Klaus Partial isometries, contractions and EP matrices. (English) Zbl 0575.15008 Linear Multilinear Algebra 13, 295-310 (1983). Reviewer: F.J.Gaines MSC: 15B57 15A60 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{K. Spindelböck}, Linear Multilinear Algebra 13, 295--310 (1983; Zbl 0575.15008) Full Text: DOI
Hall, Frank J.; Hartwig, Robert E.; Katz, Irving J.; Newman, Morris Pseudo-similarity and partial unit regularity. (English) Zbl 0544.15005 Czech. Math. J. 33(108), 361-372 (1983). Reviewer: G.P.Barker MSC: 15B33 15A21 15A09 PDFBibTeX XMLCite \textit{F. J. Hall} et al., Czech. Math. J. 33(108), 361--372 (1983; Zbl 0544.15005) Full Text: EuDML
Hartwig, Robert E.; Spindelboeck, Klaus Matrices for which A* and A+ commute. (English) Zbl 0525.15006 Linear Multilinear Algebra 14, 241-256 (1983). MSC: 15A09 15A27 15B57 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{K. Spindelboeck}, Linear Multilinear Algebra 14, 241--256 (1983; Zbl 0525.15006) Full Text: DOI
Hartwig, Robert E. Roth’s removal rule revisited. (English) Zbl 0509.15004 Linear Algebra Appl. 49, 91-115 (1983). MSC: 15A21 15A24 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Linear Algebra Appl. 49, 91--115 (1983; Zbl 0509.15004) Full Text: DOI
Hartwig, Robert E. On a theorem of Flanders. (English) Zbl 0508.15008 Proc. Am. Math. Soc. 85, 310-312 (1982). MSC: 15A21 15A09 16S50 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Proc. Am. Math. Soc. 85, 310--312 (1982; Zbl 0508.15008) Full Text: DOI
Hartwig, R. E.; Hall, F. J. Applications of the Drazin inverse to Cesaro-Neumann iterations. (English) Zbl 0506.65016 Recent applications of generalized inverses, Res. Notes Math. 66, 145-195 (1982). MSC: 65F20 15A09 40G05 15A24 PDFBibTeX XML
Hartwig, Robert E. Applications of the Wronskian and Gram matrices of \(\{t^ j \exp(\lambda_ k t)\}\). (English) Zbl 0489.34023 Linear Algebra Appl. 43, 229-241 (1982). MSC: 34L99 15A24 15A27 47E05 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Linear Algebra Appl. 43, 229--241 (1982; Zbl 0489.34023) Full Text: DOI
Hartwig, Robert E.; Drazin, Michael P. Lattice properties of the *-order for complex matrices. (English) Zbl 0485.15014 J. Math. Anal. Appl. 86, 359-378 (1982). MSC: 15A45 06F25 15B33 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{M. P. Drazin}, J. Math. Anal. Appl. 86, 359--378 (1982; Zbl 0485.15014) Full Text: DOI
Hall, Frank J.; Hartwig, Robert E. Algebraic properties of governing matrices used in Cesaro-Neumann iterations. (English) Zbl 0468.65019 Rev. Roum. Math. Pures Appl. 26, 959-978 (1981). MSC: 65F10 65F20 15A09 PDFBibTeX XMLCite \textit{F. J. Hall} and \textit{R. E. Hartwig}, Rev. Roum. Math. Pures Appl. 26, 959--978 (1981; Zbl 0468.65019)
Hartwig, Robert E.; Putcha, Mohan S. Semisimilarity for matrices over a division ring. (English) Zbl 0467.15007 Linear Algebra Appl. 39, 125-132 (1981). MSC: 15B33 15A30 17A35 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{M. S. Putcha}, Linear Algebra Appl. 39, 125--132 (1981; Zbl 0467.15007) Full Text: DOI
Hartwig, Robert E. A method for calculating Drazin inverse of square matrix A. (English) Zbl 0458.15002 Math. Jap. 26, 37-43 (1981). MSC: 15A09 15A21 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Math. Japon. 26, 37--43 (1981; Zbl 0458.15002)
Hartwig, Robert E. A note on rank-additivity. (English) Zbl 0456.15002 Linear Multilinear Algebra 10, 59-61 (1981). MSC: 15A03 15A09 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Linear Multilinear Algebra 10, 59--61 (1981; Zbl 0456.15002) Full Text: DOI
Hartwig, Robert E. Drazin inverses and canonical forms in \(M_ 0(\)Z/h). (English) Zbl 0455.15003 Linear Algebra Appl. 37, 205-233 (1981). MSC: 15A09 15A21 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Linear Algebra Appl. 37, 205--233 (1981; Zbl 0455.15003) Full Text: DOI
Levine, Jack; Hartwig, Robert E. Applications of the Drazin inverse to the Hill cryptographic system. II. (English) Zbl 0444.94012 Cryptologia 4, 150-168 (1980). MSC: 94A60 15A09 PDFBibTeX XMLCite \textit{J. Levine} and \textit{R. E. Hartwig}, Cryptologia 4, 150--168 (1980; Zbl 0444.94012) Full Text: DOI
Hartwig, Robert E. An application of the Moore-Penrose inverse to antisymmetric relations. (English) Zbl 0444.16005 Proc. Am. Math. Soc. 78, 181-186 (1980). MSC: 16W10 16E50 15A09 46L05 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Proc. Am. Math. Soc. 78, 181--186 (1980; Zbl 0444.16005) Full Text: DOI
Hartwig, Robert E. How to partially order regular elements. (English) Zbl 0442.06006 Math. Jap. 25, 1-13 (1980). MSC: 06F05 06A06 20M10 15A09 16E50 16U99 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Math. Japon. 25, 1--13 (1980; Zbl 0442.06006)
Hartwig, Robert E. Theory and applications of matrix perturbations, with respect to Hankel matrices and power formulae. (English) Zbl 0401.93021 Int. J. Syst. Sci. 10, 437-460 (1979). MSC: 93B25 93B10 15A99 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Int. J. Syst. Sci. 10, 437--460 (1979; Zbl 0401.93021) Full Text: DOI
Hartwig, Robert E.; Shoaf, Jim On the derivative of the Drazin inverse of a complex matrix. (English) Zbl 0401.15003 SIAM J. Math. Anal. 10, 207-216 (1979). MSC: 15A09 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{J. Shoaf}, SIAM J. Math. Anal. 10, 207--216 (1979; Zbl 0401.15003) Full Text: DOI
Hartwig, Robert E. A note on the partial ordering of positive semi-definite matrices. (English) Zbl 0408.15015 Linear Multilinear Algebra 6, 223-226 (1978). MSC: 15B48 15A09 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Linear Multilinear Algebra 6, 223--226 (1978; Zbl 0408.15015) Full Text: DOI
Hall, Frank J.; Hartwig, Robert E.; Katz, Irving J. A note on pseudo-similarity of matrices. (English) Zbl 0398.15009 Ind. Math. 28, 25-36 (1978). MSC: 15A21 15A09 PDFBibTeX XMLCite \textit{F. J. Hall} et al., Ind. Math. 28, 25--36 (1978; Zbl 0398.15009)
Hartwig, Robert E. Spectral inverses and the row-space equations. (English) Zbl 0388.15002 Linear Algebra Appl. 20, 57-68 (1978). MSC: 15A09 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Linear Algebra Appl. 20, 57--68 (1978; Zbl 0388.15002) Full Text: DOI
Hartwig, R. E.; Hall, F. J. Pseudo-similarity for matrices over a field. (English) Zbl 0386.15013 Proc. Am. Math. Soc. 71, 6-10 (1978). MSC: 15A24 15A09 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{F. J. Hall}, Proc. Am. Math. Soc. 71, 6--10 (1978; Zbl 0386.15013) Full Text: DOI
Hartwig, Robert E. Schur’s theorem and the Drazin inverse. (English) Zbl 0362.15003 Pac. J. Math. 78, 133-138 (1978). MSC: 15A09 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Pac. J. Math. 78, 133--138 (1978; Zbl 0362.15003) Full Text: DOI
Hartwig, Robert E. Generalized inverses of special block matrices. (English) Zbl 0424.15010 Bull. Calcutta Math. Soc. 69, 397-402 (1977). MSC: 15A09 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Bull. Calcutta Math. Soc. 69, 397--402 (1977; Zbl 0424.15010)
Hartwig, Robert E. A note on periodic matrices. (English) Zbl 0391.15004 Ind. Math. 27, 51-55 (1977). MSC: 15A09 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Ind. Math. 27, 51--55 (1977; Zbl 0391.15004)
Hartwig, R. E.; Shoaf, J. Group inverses and Drazin inverses of bidiagonal and triangular Toeplitz matrices. (English) Zbl 0372.15003 J. Aust. Math. Soc., Ser. A 24, 10-34 (1977). MSC: 15A09 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{J. Shoaf}, J. Aust. Math. Soc., Ser. A 24, 10--34 (1977; Zbl 0372.15003)
Hartwig, Robert E. Roth’s equivalence problem in unit regular rings. (English) Zbl 0347.15005 Proc. Am. Math. Soc. 59, 39-44 (1976). MSC: 15B33 15A09 16E50 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Proc. Am. Math. Soc. 59, 39--44 (1976; Zbl 0347.15005) Full Text: DOI
Hall, Frank J.; Hartwig, Robert E. Further results on generalized inverses of partitioned matrices. (English) Zbl 0345.15005 SIAM J. appl. Math. 30, 617-624 (1976). MSC: 15A09 15A21 PDFBibTeX XMLCite \textit{F. J. Hall} and \textit{R. E. Hartwig}, SIAM J. Appl. Math. 30, 617--624 (1976; Zbl 0345.15005) Full Text: DOI
Hartwig, R. E. More on the Souriau-Frame algorithm and the Drazin inverse. (English) Zbl 0335.15008 SIAM J. Appl. Math. 31, No. 1, 42-46 (1976). Reviewer: Robert E. Hartwig MSC: 15A09 PDFBibTeX XMLCite \textit{R. E. Hartwig}, SIAM J. Appl. Math. 31, 42--46 (1976; Zbl 0335.15008) Full Text: DOI
Hartwig, Robert E. Singular value decomposition and the Moore-Penrose inverse of bordered matrices. (English) Zbl 0335.15006 SIAM J. Appl. Math. 31, No. 1, 31-41 (1976). Reviewer: Robert E. Hartwig MSC: 15A09 PDFBibTeX XMLCite \textit{R. E. Hartwig}, SIAM J. Appl. Math. 31, 31--41 (1976; Zbl 0335.15006) Full Text: DOI
Hartwig, Robert E. Rank factorization and Moore-Penrose inversion. (English) Zbl 0335.15005 Ind. Math. 26, 49-63 (1976). Reviewer: Robert E. Hartwig MSC: 15A09 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Ind. Math. 26, 49--63 (1976; Zbl 0335.15005)
Hartwig, Robert E. Block generalized inverses. (English) Zbl 0335.15004 Arch. Ration. Mech. Anal. 61, 197-251 (1976). Reviewer: Robert E. Hartwig MSC: 15A09 15B33 16E50 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Arch. Ration. Mech. Anal. 61, 197--251 (1976; Zbl 0335.15004) Full Text: DOI
Hartwig, Robert E.; Katz, Irving J. Products of EP elements in reflexive semigroups. (English) Zbl 0329.20052 Linear Algebra Appl. 14, 11-19 (1976). MSC: 20M99 15-00 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{I. J. Katz}, Linear Algebra Appl. 14, 11--19 (1976; Zbl 0329.20052) Full Text: DOI
Hartwig, Robert E.; Morris, S. Brent The universal flip matrix and the generalized faro-shuffle. (English) Zbl 0316.15013 Pac. J. Math. 58, 445-455 (1975). MSC: 15B57 05B20 PDFBibTeX XMLCite \textit{R. E. Hartwig} and \textit{S. B. Morris}, Pac. J. Math. 58, 445--455 (1975; Zbl 0316.15013) Full Text: DOI
Hartwig, Robert E. 1-2 inverses and the invariance of \(BA^+C\). (English) Zbl 0312.15001 Linear Algebra Appl. 11, 271-275 (1975). MSC: 15A09 16E50 PDFBibTeX XMLCite \textit{R. E. Hartwig}, Linear Algebra Appl. 11, 271--275 (1975; Zbl 0312.15001) Full Text: DOI
Hartwig, Robert E. AX-XB=C, resultants and generalized inverses. (English) Zbl 0268.15004 SIAM J. appl. Math. 28, 154-183 (1975). MSC: 15A09 15A24 PDFBibTeX XMLCite \textit{R. E. Hartwig}, SIAM J. Appl. Math. 28, 154--183 (1975; Zbl 0268.15004) Full Text: DOI
Hartwig, Robert E. The resultant and the matrix equation AX = XB. (English) Zbl 0243.15008 SIAM J. Appl. Math. 22, 538-544 (1972). MSC: 15A24 PDFBibTeX XMLCite \textit{R. E. Hartwig}, SIAM J. Appl. Math. 22, 538--544 (1972; Zbl 0243.15008) Full Text: DOI
Hartwig, Robert E. Resultants and the solution of AX - XB = - C. (English) Zbl 0222.15007 SIAM J. Appl. Math. 23, 104-117 (1972). MSC: 15A24 PDFBibTeX XMLCite \textit{R. E. Hartwig}, SIAM J. Appl. Math. 23, 104--117 (1972; Zbl 0222.15007) Full Text: DOI
Hartwig, Robert E. A note on Jacobson chains. (English) Zbl 0222.15006 SIAM J. Appl. Math. 23, 99-103 (1972). MSC: 15A21 PDFBibTeX XMLCite \textit{R. E. Hartwig}, SIAM J. Appl. Math. 23, 99--103 (1972; Zbl 0222.15006) Full Text: DOI