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Oct 5, 2020 at 19:18 comment added Ryan Budney @Arrow: Apologies, my website is in transition. Feel free to e-mail me and I could send you a copy.
Oct 5, 2020 at 9:06 comment added Arrow Dear @RyanBudney, the link seems to be broken.
Apr 22, 2018 at 1:40 history edited Qfwfq CC BY-SA 3.0
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Apr 22, 2018 at 0:49 answer added Igor Rivin timeline score: 3
Apr 20, 2018 at 20:23 comment added Ryan Budney My DG lecture notes develop Ehresmann's framework somewhat. They're really only partially inspired by his work. The formalism is fairly minimalist. There are no groupoids, no categories, there are no abstract manifolds -- everything is with submanifolds of $\mathbb R^n$. So it's probably not what you want, but here they are: rybu.org/sites/default/files/math_docs/dgnotes/… One of the more interesting aspects of this formalism is how little work it takes to compute things like the Riemann curvature tensor for typical examples.
Apr 20, 2018 at 20:04 history asked santker heboln CC BY-SA 3.0