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Top Questions
10
votes
Why does every 7-manifold bound an 8-manifold?
algebraic-topology
asked Jan 19 '11 at 7:40
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6
votes
A Way to make the following “proof” of the Hairy Ball Theorem rigorous?
algebraic-topology
differential-geometry
asked May 10 '11 at 0:55
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Top Answers
33
Why in an inconsistent axiom system every statement is true? (For Dummies)
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15
Good book/lecture notes about category theory
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11
Intuition behind homology with general coefficients
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9
Applications of algebraic topology
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9
How to prove $(f \circ\ g) ^{-1} = g^{-1} \circ\ f^{-1}$?
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7
$\sqrt a$ is either an integer or an irrational number.
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5
Does naturality imply isomorphism invariance for characteristic classes?
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5
Homology of punctured projective space
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5
Is the functor $\mbox{Rings}\rightarrow \mbox{Sets}$ given by $R \mapsto \{\pm 1 \in R\}$ corepresentable?
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5
Why is $\pi_* MU$ concentrated in even degrees?
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5
Covering map on the unit disk
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5
A question about domains
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