5

Questions
votes newest views recent
 
1
vote
2
answers
216
views

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

nov 25 11 at 1:18 lethe 448●3●8

9
26
votes
1
answer
1k
views

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

oct 15 11 at 23:30 Francesco Polizzi 19k●2●34●55

3
7
votes
4
answers
537
views

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

apr 21 11 at 7:36 Oscar Randal-Williams 5,155●1●12●26

 
6
votes
2
answers
360
views

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

mar 12 11 at 10:33 Bruno Martelli 4,732●1●12●33

 
2
votes
2
answers
546
views

Can we deduce that two rings R1 and R2 are isomorphic if their polynomial ring is iso.?

dec 8 10 at 14:11 Steven Landsburg 8,634●1●27●47