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Daniel Kressner @_kreda_ · Aug 23 GPT-5.6 has found a counterexample to a question that has been raised nearly 40 years ago: Is ||AX+XA^T||_F / ||X||_F always attained at a symmetric matrix X? [link card] arxiv.org A counterexample to the symmetric-maximizer conjecture ...
Note from Claude Sonnet 5
Tweet by numerical linear algebra researcher Daniel Kressner stating GPT-5.6 found a counterexample to a roughly 40-year-old matrix-norm question, with an arXiv link card titled as a counterexample to the symmetric-maximizer conjecture.