Cinzori, Isaac; Johnson, Charles R.; Lang, Hannah An explicit upper bound on disparity for trees of a given diameter. (English) Zbl 1511.05133 Linear Multilinear Algebra 70, No. 19, 4584-4596 (2022). MSC: 05C50 05C05 15A18 15A42 PDFBibTeX XMLCite \textit{I. Cinzori} et al., Linear Multilinear Algebra 70, No. 19, 4584--4596 (2022; Zbl 1511.05133) Full Text: DOI
Johnson, Charles; Waugh, M.; Zhang, Yulin Tree sign pattern that permit eventual positivity. (English) Zbl 1507.15019 Linear Algebra Appl. 650, 162-168 (2022). Reviewer: Sanming Zhou (Parkville) MSC: 15B48 15B35 PDFBibTeX XMLCite \textit{C. Johnson} et al., Linear Algebra Appl. 650, 162--168 (2022; Zbl 1507.15019) Full Text: DOI
Johnson, Charles R.; Wakhare, Tanay The inverse eigenvalue problem for linear trees. (English) Zbl 1483.15008 Discrete Math. 345, No. 4, Article ID 112737, 17 p. (2022). MSC: 15A29 15A18 05C50 05C05 PDFBibTeX XMLCite \textit{C. R. Johnson} and \textit{T. Wakhare}, Discrete Math. 345, No. 4, Article ID 112737, 17 p. (2022; Zbl 1483.15008) Full Text: DOI arXiv
Carter, D.; DiMarco, K. E.; Johnson, C. R.; Wedemeyer, L.; Yu, Z. The totally positive completion problem: the 3-by-n case. (English) Zbl 1479.15031 Spec. Matrices 9, 226-239 (2021). MSC: 15A83 15B48 PDFBibTeX XMLCite \textit{D. Carter} et al., Spec. Matrices 9, 226--239 (2021; Zbl 1479.15031) Full Text: DOI
Furtado, Susana; Johnson, C. R.; Zhang, Yulin Linear preservers of copositive matrices. (English) Zbl 1472.15040 Linear Multilinear Algebra 69, No. 10, 1779-1788 (2021). MSC: 15A86 15A04 15B48 PDFBibTeX XMLCite \textit{S. Furtado} et al., Linear Multilinear Algebra 69, No. 10, 1779--1788 (2021; Zbl 1472.15040) Full Text: DOI Link
Johnson, Charles R.; Saiago, Carlos M.; Toyonaga, Kenji Change in vertex status after removal of another vertex in the general setting. (English) Zbl 1476.15015 Linear Algebra Appl. 612, 128-145 (2021). Reviewer: Shariefuddin Pirzada (Srinagar) MSC: 15A18 05B20 05C50 PDFBibTeX XMLCite \textit{C. R. Johnson} et al., Linear Algebra Appl. 612, 128--145 (2021; Zbl 1476.15015) Full Text: DOI
Chang, Haoge; Johnson, C. R. Completion of TP and TN border patterns. (English) Zbl 1450.15027 Linear Multilinear Algebra 68, No. 9, 1753-1766 (2020). MSC: 15A83 15A15 15B48 PDFBibTeX XMLCite \textit{H. Chang} and \textit{C. R. Johnson}, Linear Multilinear Algebra 68, No. 9, 1753--1766 (2020; Zbl 1450.15027) Full Text: DOI
Johnson, Charles R.; Julio, Ana I.; Soto, Ricardo L. Nonnegative realizability with Jordan structure. (English) Zbl 1475.15012 Linear Algebra Appl. 587, 302-313 (2020). MSC: 15A20 15A18 15A29 PDFBibTeX XMLCite \textit{C. R. Johnson} et al., Linear Algebra Appl. 587, 302--313 (2020; Zbl 1475.15012) Full Text: DOI
Bechtold, B. K.; Johnson, C. R. Monotonicity, path product matrices, and principal submatrices. (English) Zbl 1437.15043 Linear Algebra Appl. 593, 269-275 (2020). Reviewer: John D. Dixon (Ottawa) MSC: 15B48 15A21 15A09 15A15 PDFBibTeX XMLCite \textit{B. K. Bechtold} and \textit{C. R. Johnson}, Linear Algebra Appl. 593, 269--275 (2020; Zbl 1437.15043) Full Text: DOI
Johnson, Charles R.; Marijuán, Carlos; Paparella, Pietro; Pisonero, Miriam The NIEP. (English) Zbl 1427.15001 André, Carlos (ed.) et al., Operator theory, operator algebras, and matrix theory. Based on the presentations at the international workshop on operator theory and operator algebras, WOAT 2016, Lisbon, Portugal, July 5–8, 2016. Cham: Birkhäuser. Oper. Theory: Adv. Appl. 267, 199-220 (2018). Reviewer: Tin Yau Tam (Reno) MSC: 15-02 15A29 15A18 15A42 PDFBibTeX XMLCite \textit{C. R. Johnson} et al., Oper. Theory: Adv. Appl. 267, 199--220 (2018; Zbl 1427.15001) Full Text: DOI arXiv Link
Collao, Macarena; Johnson, Charles R.; Soto, Ricardo L. Universal realizability of spectra with two positive eigenvalues. (English) Zbl 1391.15037 Linear Algebra Appl. 545, 226-239 (2018). MSC: 15A18 15A21 15A29 PDFBibTeX XMLCite \textit{M. Collao} et al., Linear Algebra Appl. 545, 226--239 (2018; Zbl 1391.15037) Full Text: DOI
Johnson, Charles R.; Zhang, Yulin Multiplicity lists for symmetric matrices whose graphs have few missing edges. (English) Zbl 1380.15009 Linear Algebra Appl. 540, 221-233 (2018). MSC: 15A18 15B57 05C50 PDFBibTeX XMLCite \textit{C. R. Johnson} and \textit{Y. Zhang}, Linear Algebra Appl. 540, 221--233 (2018; Zbl 1380.15009) Full Text: DOI Link
Johnson, Charles R.; Paparella, Pietro Row cones, Perron similarities, and nonnegative spectra. (English) Zbl 1387.15010 Linear Multilinear Algebra 65, No. 10, 2124-2130 (2017). MSC: 15A18 15A29 15B48 PDFBibTeX XMLCite \textit{C. R. Johnson} and \textit{P. Paparella}, Linear Multilinear Algebra 65, No. 10, 2124--2130 (2017; Zbl 1387.15010) Full Text: DOI arXiv
Johnson, Charles R.; Turnansky, Morrison Normal matrices subordinate to a graph. (English) Zbl 1489.15034 Linear Algebra Appl. 531, 54-63 (2017). MSC: 15A60 05C05 05C50 PDFBibTeX XMLCite \textit{C. R. Johnson} and \textit{M. Turnansky}, Linear Algebra Appl. 531, 54--63 (2017; Zbl 1489.15034) Full Text: DOI Link
Johnson, C. R.; Marijuán, C.; Pisonero, M. Symmetric nonnegative realizability via partitioned majorization. (English) Zbl 1375.15015 Linear Multilinear Algebra 65, No. 7, 1417-1426 (2017). Reviewer: C. M. da Fonseca (Safat) MSC: 15A18 15A29 15A42 65F18 PDFBibTeX XMLCite \textit{C. R. Johnson} et al., Linear Multilinear Algebra 65, No. 7, 1417--1426 (2017; Zbl 1375.15015) Full Text: DOI
Fallat, Shaun; Johnson, Charles R.; Sokal, Alan D. Total positivity of sums, Hadamard products and Hadamard powers: results and counterexamples. (English) Zbl 1359.15027 Linear Algebra Appl. 520, 242-259 (2017); corrigendum ibid. 613, 393-396 (2021). MSC: 15B48 15B05 44A60 PDFBibTeX XMLCite \textit{S. Fallat} et al., Linear Algebra Appl. 520, 242--259 (2017; Zbl 1359.15027) Full Text: DOI arXiv
Johnson, C. R.; Marijuán, C.; Pisonero, M. Ruling out certain 5-spectra for the symmetric nonnegative inverse eigenvalue problem. (English) Zbl 1353.15008 Linear Algebra Appl. 512, 129-135 (2017). MSC: 15A18 15A29 15A42 PDFBibTeX XMLCite \textit{C. R. Johnson} et al., Linear Algebra Appl. 512, 129--135 (2017; Zbl 1353.15008) Full Text: DOI
Johnson, Charles R.; Peña, J. M.; Szulc, Tomasz Optimal Gersgorin-style estimation of the largest singular value. II. (English) Zbl 1367.65055 Electron. J. Linear Algebra 31, 679-685 (2016). MSC: 65F15 15A18 15A42 15B48 PDFBibTeX XMLCite \textit{C. R. Johnson} et al., Electron. J. Linear Algebra 31, 679--685 (2016; Zbl 1367.65055) Full Text: DOI Link
Buckley, Shannon P.; Corliss, Joseph G.; Johnson, Charles R.; Araúz Lombardía, Cristina; Saiago, Carlos M. Questions, conjectures, and data about multiplicity lists for trees. (English) Zbl 1350.05092 Linear Algebra Appl. 511, 72-109 (2016). MSC: 05C50 05C05 15A18 PDFBibTeX XMLCite \textit{S. P. Buckley} et al., Linear Algebra Appl. 511, 72--109 (2016; Zbl 1350.05092) Full Text: DOI
Johnson, Charles R.; Spitkovsky, Ilya M.; Stevanovic, Mirjana; Turnansky, Morrison Normal matrices subordinate to a tree and flat portions of the field of values. (English) Zbl 1343.05093 Linear Algebra Appl. 507, 198-207 (2016). MSC: 05C50 05B20 05C05 15A60 15B57 PDFBibTeX XMLCite \textit{C. R. Johnson} et al., Linear Algebra Appl. 507, 198--207 (2016; Zbl 1343.05093) Full Text: DOI
Hu, Xiaonan; Johnson, Charles R.; Davis, Caroline E.; Zhang, Yimeng Ranks of permutative matrices. (English) Zbl 1338.05030 Spec. Matrices 4, 233-246 (2016). MSC: 05B20 15A03 15A15 15B48 PDFBibTeX XMLCite \textit{X. Hu} et al., Spec. Matrices 4, 233--246 (2016; Zbl 1338.05030) Full Text: DOI
Costas-Santos, R. S.; Johnson, C. R. Matrices totally positive relative to a tree. II. (English) Zbl 1337.15025 Linear Algebra Appl. 505, 1-10 (2016). MSC: 15B48 05C50 15A18 PDFBibTeX XMLCite \textit{R. S. Costas-Santos} and \textit{C. R. Johnson}, Linear Algebra Appl. 505, 1--10 (2016; Zbl 1337.15025) Full Text: DOI arXiv
Johnson, Charles R.; Reams, Robert B. Sufficient conditions to be exceptional. (English) Zbl 1338.15025 Spec. Matrices 4, 67-72 (2016). MSC: 15A18 15B48 15B57 15A63 PDFBibTeX XMLCite \textit{C. R. Johnson} and \textit{R. B. Reams}, Spec. Matrices 4, 67--72 (2016; Zbl 1338.15025) Full Text: DOI
Johnson, Charles R.; Paparella, Pietro Perron spectratopes and the real nonnegative inverse eigenvalue problem. (English) Zbl 1329.15028 Linear Algebra Appl. 493, 281-300 (2016). MSC: 15A18 15B48 15A29 05B20 05E30 PDFBibTeX XMLCite \textit{C. R. Johnson} and \textit{P. Paparella}, Linear Algebra Appl. 493, 281--300 (2016; Zbl 1329.15028) Full Text: DOI arXiv
Johnson, Charles R.; Zhang, Yulin TP perturbation of TN matrices and totally positive directions. (English) Zbl 1329.15065 Linear Algebra Appl. 490, 66-76 (2016). MSC: 15B48 15A83 PDFBibTeX XMLCite \textit{C. R. Johnson} and \textit{Y. Zhang}, Linear Algebra Appl. 490, 66--76 (2016; Zbl 1329.15065) Full Text: DOI
Johnson, Charles R.; Šmigoc, Helena; Yang, Dian Solution theory for systems of bilinear equations. (English) Zbl 1307.15040 Linear Multilinear Algebra 62, No. 12, 1553-1566 (2014). Reviewer: Juan Ramon Torregrosa Sanchez (Valencia) MSC: 15A83 15A63 PDFBibTeX XMLCite \textit{C. R. Johnson} et al., Linear Multilinear Algebra 62, No. 12, 1553--1566 (2014; Zbl 1307.15040) Full Text: DOI arXiv
Johnson, Charles R.; Li, Andrew A.; Walker, Andrew J. Ordered multiplicity lists for eigenvalues of symmetric matrices whose graph is a linear tree. (English) Zbl 1298.05068 Discrete Math. 333, 39-55 (2014). MSC: 05C05 05C07 PDFBibTeX XMLCite \textit{C. R. Johnson} et al., Discrete Math. 333, 39--55 (2014; Zbl 1298.05068) Full Text: DOI
Chen, Zhao; Grimm, Matthew; McMichael, Paul; Johnson, Charles R. Undirected graphs of Hermitian matrices that admit only two distinct eigenvalues. (English) Zbl 1295.05141 Linear Algebra Appl. 458, 403-428 (2014). MSC: 05C50 15B57 15A18 15A63 PDFBibTeX XMLCite \textit{Z. Chen} et al., Linear Algebra Appl. 458, 403--428 (2014; Zbl 1295.05141) Full Text: DOI
Johnson, Charles R.; Wei, Zhen Asymmetric TP and TN completion problems. (English) Zbl 1261.15035 Linear Algebra Appl. 438, No. 5, 2127-2135 (2013). Reviewer: Costică Moroşanu (Iaşi) MSC: 15A83 15B35 PDFBibTeX XMLCite \textit{C. R. Johnson} and \textit{Z. Wei}, Linear Algebra Appl. 438, No. 5, 2127--2135 (2013; Zbl 1261.15035) Full Text: DOI
Charles, Zachary B.; Farber, Miriam; Johnson, Charles R.; Kennedy-Shaffer, Lee The relation between the diagonal entries and the eigenvalues of a symmetric matrix, based upon the sign pattern of its off-diagonal entries. (English) Zbl 1264.15046 Linear Algebra Appl. 438, No. 3, 1427-1445 (2013). Reviewer: Dimitris P. Vartziotis (Ioannina) MSC: 15B57 15A18 15B35 PDFBibTeX XMLCite \textit{Z. B. Charles} et al., Linear Algebra Appl. 438, No. 3, 1427--1445 (2013; Zbl 1264.15046) Full Text: DOI
Johnson, Charles R.; Smith, Ronald L. Inverse \(M\)-matrices. II. (English) Zbl 1218.15015 Linear Algebra Appl. 435, No. 5, 953-983 (2011). MSC: 15B48 PDFBibTeX XMLCite \textit{C. R. Johnson} and \textit{R. L. Smith}, Linear Algebra Appl. 435, No. 5, 953--983 (2011; Zbl 1218.15015) Full Text: DOI
Einstein, Eduard; Johnson, Charles R.; Lins, Brian; Spitkovsky, Ilya The ratio field of values. (English) Zbl 1209.15024 Linear Algebra Appl. 434, No. 4, 1119-1136 (2011). Reviewer: Alexey Alimov (Moskva) MSC: 15A60 15A18 15A22 15A54 PDFBibTeX XMLCite \textit{E. Einstein} et al., Linear Algebra Appl. 434, No. 4, 1119--1136 (2011; Zbl 1209.15024) Full Text: DOI
Johnson, Charles R.; Leal Duarte, António; Saiago, Carlos M. The structure of matrices with a maximum multiplicity eigenvalue. (English) Zbl 1143.15005 Linear Algebra Appl. 429, No. 4, 875-886 (2008). MSC: 15A18 15B57 05C50 PDFBibTeX XMLCite \textit{C. R. Johnson} et al., Linear Algebra Appl. 429, No. 4, 875--886 (2008; Zbl 1143.15005) Full Text: DOI Link
Coakley, Edward S.; Dopico, Froilán M.; Johnson, Charles R. Matrices with orthogonal groups admitting only determinant one. (English) Zbl 1136.15008 Linear Algebra Appl. 428, No. 4, 796-813 (2008). Reviewer: John D. Dixon (Ottawa) MSC: 15A21 15A15 15A22 15A24 15A30 20G20 PDFBibTeX XMLCite \textit{E. S. Coakley} et al., Linear Algebra Appl. 428, No. 4, 796--813 (2008; Zbl 1136.15008) Full Text: DOI
Dopico, Froilán M.; Johnson, Charles R. Complementary bases in symplectic matrices and a proof that their determinant is one. (English) Zbl 1112.15002 Linear Algebra Appl. 419, No. 2-3, 772-778 (2006). Reviewer: Hans Havlicek (Wien) MSC: 15A03 15B57 15A15 15A09 PDFBibTeX XMLCite \textit{F. M. Dopico} and \textit{C. R. Johnson}, Linear Algebra Appl. 419, No. 2--3, 772--778 (2006; Zbl 1112.15002) Full Text: DOI
Johnson, Charles R.; Saiago, Carlos M. The trees for which maximum multiplicity implies the simplicity of other eigenvalues. (English) Zbl 1105.05013 Discrete Math. 306, No. 23, 3130-3135 (2006). MSC: 05C05 05C50 PDFBibTeX XMLCite \textit{C. R. Johnson} and \textit{C. M. Saiago}, Discrete Math. 306, No. 23, 3130--3135 (2006; Zbl 1105.05013) Full Text: DOI
Hogben, Leslie; Johnson, Charles R.; Reams, Robert The copositive completion problem. (English) Zbl 1098.15010 Linear Algebra Appl. 408, 207-211 (2005). Reviewer: Rabe von Randow (Bonn) MSC: 15A29 15A18 15B48 15B51 PDFBibTeX XMLCite \textit{L. Hogben} et al., Linear Algebra Appl. 408, 207--211 (2005; Zbl 1098.15010) Full Text: DOI Link
Johnson, Charles R.; Leal Duarte, António; Saiago, Carlos M. Inverse eigenvalue problems and lists of multiplicities of eigenvalues for matrices whose graph is a tree: The case of generalized stars and double generalized stars. (English) Zbl 1035.15010 Linear Algebra Appl. 373, 311-330 (2003). Reviewer: E. Kreyszig (Ottawa) MSC: 15A18 15A29 05C50 PDFBibTeX XMLCite \textit{C. R. Johnson} et al., Linear Algebra Appl. 373, 311--330 (2003; Zbl 1035.15010) Full Text: DOI
Crans, Alissa S.; Fallat, Shaun M.; Johnson, Charles R. The Hadamard core of the totally nonnegative matrices. (English) Zbl 0989.15009 Linear Algebra Appl. 328, No. 1-3, 203-222 (2001). Reviewer: Václav Burjan (Praha) MSC: 15B48 PDFBibTeX XMLCite \textit{A. S. Crans} et al., Linear Algebra Appl. 328, No. 1--3, 203--222 (2001; Zbl 0989.15009) Full Text: DOI
Fallat, Shaun M.; Johnson, Charles R.; Torregrosa, Juan R.; Urbano, Ana M. \(P\)-matrix completions under weak symmetry assumptions. (English) Zbl 0963.15021 Linear Algebra Appl. 312, No. 1-3, 73-91 (2000). Reviewer: Rodica Covaci (Cluj-Napoca) MSC: 15B48 15A29 PDFBibTeX XMLCite \textit{S. M. Fallat} et al., Linear Algebra Appl. 312, No. 1--3, 73--91 (2000; Zbl 0963.15021) Full Text: DOI
Fallat, Shaun M.; Johnson, Charles R. Sub-direct sums and positivity classes of matrices. (English) Zbl 0973.15013 Linear Algebra Appl. 288, No. 1-3, 149-173 (1999). MSC: 15B48 PDFBibTeX XMLCite \textit{S. M. Fallat} and \textit{C. R. Johnson}, Linear Algebra Appl. 288, No. 1--3, 149--173 (1999; Zbl 0973.15013) Full Text: DOI