Abstract
One of the most fruitful activities that takes place at a conference is the interchange of problems. Often, in later years the success of a conference may be judged by the number of problems raised there which are eventually solved. The papers in the remainder of this volume contain several problems, but here are some more that did not fit naturally into any of those papers. I hope to see solutions of at least some of these problems in the pages of Positivity in years to come.
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References
T. Kurmayya, K.C. Sivakumar, Nonnegative Moore–Penrose inverses of Gram operators, Lin. Alg. Appl., 422 (2007), 471–476.
P. Robert, On the group-inverse of a linear transformation, J. Math. Anal. Appl., 22 (1968), 658–669.
K.C. Sivakumar, A new characterization of nonnegativity of Moore–Penrose inverses of Gram operators, this volume.
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Wickstead, A.W. Open problems. Positivity 13, 299–306 (2009). https://doi.org/10.1007/s11117-008-9004-4
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DOI: https://doi.org/10.1007/s11117-008-9004-4