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Questions

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

oct 15 11 at 23:30 Francesco Polizzi 19.2k23656

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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 5,40911428

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

mar 12 11 at 10:33 Bruno Martelli 5,02611434

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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 9,55112952

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