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Questions about mathematics which don't fall into the other arXiv categories. If you have a general question about mathematics but it is not research level, it's off-topic but it might be welcomed on Mathematics Stack Exchange.

3 votes

How to refer to a “theorem” that you have shown to be wrong

Another example is the paper "Affine semigroups and Cohen-Macaulay rings" by Hoa and Trung (Trans. AMS 298, 1986) in which they give a counterexample to a result of Goto and Watanabe. Rumor has it th …