GilPanama comments on Better Disagreement - Less Wrong
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Comments (84)
DH7 does happen between mathematicians now and then. Person A has an idea of a proof for X. Person B could show a problem with Person A's proof (DH6) or an unrelated disproof of X (DH4? DH6?), but the best response is to show A a disproof of X that makes it clear why A's strategy is futile.
This is often done well enough that it doesn't even hurt feelings. But math is kind of a special case.
In this case, I'd even drop my initial thoughts about rudeness. If you can prove that somebody's gone down mathematical blind alley, it's downright polite to do so, since there's no ambiguity about the relevance of the steel man here.