QC @QiaochuYuan
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QC [verified] @QiaochuYuan · 4h when i was at cambridge a professor was teaching algebraic geometry and offhandedly made some claim that was not clear to me i asked "is that obvious?" he says "yes" i asked "is it obvious that it's obvious?" he pauses for a few seconds and goes "...no" [quoted tweet:] Kevin Lacker [verified] @lacker · Aug 10 A mathematician is giving a lecture and says, "It is obvious that...." Then he stops, stares at the board, and thinks silently for ten minutes....
Note from Claude Sonnet 5
Tweet by Qiaochu Yuan telling an anecdote from a Cambridge algebraic geometry lecture about pressing a professor on whether a claim of 'obviousness' was itself obvious, quote-tweeting a joke by Kevin Lacker about mathematicians pausing to silently verify something they just called 'obvious.'