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Manifolds with a non-degenerate symmetric bilinear form in each tangent space varying differentiably but with constant index and signature.

13 votes

Is it possible to do calculus and differential geometry the old school way, without any orth...

I do think you're asking a reasonable question, but many do not like your way of asking it. It would be better received if you could express it more rigorously and mathematically and showed that you h …
Deane Yang's user avatar
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