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Honglu
  • Member for 13 years, 5 months
  • Last seen more than 5 years ago
39 votes
1 answer
2k views

$V$, $W$ are varieties. Does $V\times \mathbf{P}^1=W\times \mathbf{P}^1$ imply $V=W$?

15 votes
4 answers
2k views

A combinatorial identity

8 votes
2 answers
2k views

Can we deduce that two rings $R_1$ and $R_2$ are isomorphic if their polynomial ring are isomorphic?

8 votes
2 answers
586 views

Can a smooth, immersed loop in R^2 become not nullhomotopic by removing a point?

8 votes
4 answers
915 views

How does all of the bundles over a certain manifold characterize the homotopy class of the base manifold?

4 votes
2 answers
288 views

Connectedness of moduli of vector bundles

3 votes
1 answer
323 views

Hypersurfaces without variable cohomology

2 votes
0 answers
296 views

Hypersurfaces covered by high genus curves

2 votes
2 answers
381 views

Contractible noncompact 3-manifold without boundary not homeomorphic to $\Bbb R^3$

2 votes
0 answers
190 views

Finite resolution by sums of line bundles on toric varieties