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| | CHARLES R. JOHNSON, Ph.D. |
 | | Charles Johnson works primarily in matrix analysis, linear algebra, and discrete mathematics. |
 | | Accordingly, Johnson researches combinatorial matrix theory, including matrix completion problems and qualitative matrix theory, inequalilities for generalized matrix functions, norms, numerical ranges, eigenvalues, and non-negative matrices. |
 | | Qualitative matrix theory, for example, is motivated by problems in biology, chemistry, and economics in which qualitative information about model parameters is known from theory, while precise quantitative information is difficult to obtain. |
| as.wm.edu /Faculty/Johnson.html (100 words) |
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