Tangent joke: > A British mathematician was giving a talk in Grothendieck's seminar in Paris. He started "Let X be a variety...". This caused some talking amon

Tangent joke: > A British mathematician was giving a talk in Grothendieck's seminar in Paris. He started "Let X be a variety...". This caused some talking among the students sitting in the back, who were asking each other "What's a variety?". J.-P. Serre, sitting in the front row, turns around a bit annoyed and says "Integral scheme of finite type over a field". found it on /r/math: https://www.reddit.com/r/math/comments/7qjxbe/whats_your_favorite_math_joke_that_requires_at/ https://www.reddit.com/r/math/comments/7qjxbe/whats_your_fav...