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Jun
24
accepted Is there a largest large cardinal?
Jun
17
comment Is there a topos in which the natural numbers object are the finite dimensional vector spaces?
That they and Jackson use lattices is I think intriguing.
Jun
17
comment Is there a topos in which the natural numbers object are the finite dimensional vector spaces?
@catherine Ray: yes, that's right; it was Jacksons thesis that provoked the question; your suggestion of smooth topoi is interesting as is the continuous geometry of Neumanns - I had heard of them, but didn't think to make the connection.
Jun
6
accepted Example of a surjective submersion that is not locally a product?
Jun
6
asked Example of a surjective submersion that is not locally a product?
Jun
1
awarded  Self-Learner
May
17
answered Finding the shortest distance to the north of the sphere
May
17
revised “Vectors aren't really numbers” - how sound is that statement?
added 128 characters in body
May
17
answered “Vectors aren't really numbers” - how sound is that statement?
May
17
revised What algebraic structure do self-adjoint operators form?
added 5 characters in body; edited tags
May
17
revised What algebraic structure do self-adjoint operators form?
added 16 characters in body
May
17
asked What algebraic structure do self-adjoint operators form?
May
7
accepted Universal covers of the rotation group
May
7
accepted Spinors and Möbius strips
May
7
asked Universal covers of the rotation group
May
7
revised Forms and conservative forces
added 47 characters in body
May
7
revised Forms and conservative forces
added 47 characters in body
May
7
asked Forms and conservative forces
May
7
asked Spinors and Möbius strips
Apr
28
accepted When is the pullback of a tangent bundle along a curve a tangent bundle on the curve?