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Complex, contact, Riemannian, pseudo-Riemannian and Finsler geometry, relativity, gauge theory, global analysis.

9 votes

Mistakes in Bredon's book "Topology and Geometry"?

I think that you are missing the definition of 'orientable along $A$'. I haven't got that book of Bredon to hand, but presumably 'orientable along $A$' means that if you move a local orientation of …
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4 votes

Are geodesics necessarily embedded?

Take a long strip of paper, and draw a long straight line down the middle of it. Now without folding the paper, glue two far apart pieces together in such a way that the two glued parts of the line c …
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