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mma
  • Member for 11 years, 3 months
  • Last seen more than a week ago
15 votes

What is the opposite category of $Set$?

1 vote
Accepted

Does Minkowski space have anything to do with Minkowski geometry?

1 vote
Accepted

Concise notation for the central extension defined by a cocycle

1 vote

Is every collineation of the real projective plane given by some linear transformations?

0 votes
Accepted

Why must the stationary state vectors rotate?

0 votes

A Pythagoras-like conjecture using complex numbers

0 votes
Accepted

A Pythagoras-like conjecture using complex numbers

0 votes

Center of wheel travels the length of circumference in one revolution

0 votes

What is the Grassmann algebra of $2\times 2$ complex matrices?

0 votes

Compatible Hilbert space subspaces - need help understanding a statement made in a book

0 votes

What is the true relationship between impossible figures and cohomology?