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68
$V$, $W$ are varieties. Does $V\times \mathbf{P}^1=W\times \mathbf{P}^1$ imply $V=W$?
Oct 15 '11 at 9:01
53
What group is $\langle a,b \,| \, a^2=b^2 \rangle$?
Dec 13 '10 at 21:51
48
Example of 4-manifold with $\pi_1=\mathbb Q$
Jul 1 '13 at 14:09
42
Does one real radical root imply they all are?
Sep 30 '14 at 18:41
38
Residual finiteness: why do we care?
Feb 26 '15 at 20:12
34
When is a singular point of a variety smooth?
May 30 '12 at 12:31
34
Do finite groups acting on a ball have a fixed point?
Oct 18 '11 at 23:27
30
What is a square root of a line bundle?
Nov 3 '10 at 16:33
27
Non-degenerate alternating bilinear form on a finite abelian group
Mar 18 '11 at 11:47
26
Sheaves on Contractible Analytic Spaces
May 22 '13 at 14:55
23
Non-homeomorphic spaces such that taking away a point makes them homeomorphic
Aug 4 '15 at 10:18
23
Strict applications of deformation theory in which to dip one's toe
Jun 20 '13 at 7:20
22
Why is it so hard to prove Toeplitz' conjecture?
Jul 31 '15 at 21:27
21
Is there anything special about the Riemann surface $y^2 = x(x^{10}+11x^5-1)$?
Feb 29 '12 at 10:49
21
What is a Lagrangian submanifold intuitively?
Mar 31 '11 at 16:56
19
When is the pushforward of a vector bundle still a vector bundle?
Jun 9 '11 at 23:17
19
Must an algebraic variety with trivial tangent bundle be an abelian variety?
Apr 21 '15 at 8:18
19
Intersection of subvarieties in grassmannian space
Jan 14 '11 at 14:28
18
What is the mathematical structure called if we replace commutative group by commutative monoid in the definition of linear space?
Apr 20 '15 at 8:57
18
What's coherent about coherent sheaves?
Oct 29 '10 at 7:14
17
Which almost complex manifolds admit a complex structure?
Jan 23 '11 at 14:52
16
Detecting if a polynomial is a Pfaffian
Jun 25 '11 at 20:47
16
Classification of complex structures on $\mathbb{R}^{2n}$
Apr 20 '15 at 13:47
16
Rigorous version of heuristic argument for genus-degree formula?
Jun 5 '14 at 22:04
16
Is a holomorphic family whose fibers are all smooth locally trivial?
Aug 22 '13 at 13:29
16
Maximal ideals in a polynomial ring over the real numbers.
Jan 17 '12 at 16:57
16
Bezout's Theorem for weighted homogeneous polynomials
Nov 14 '11 at 22:09
15
What is an example of an orbifold which is not a topological manifold?
Mar 7 at 22:25
15
Quotient of abelian variety by an abelian subvariety
Sep 2 '10 at 21:48
15
Maps to projective space == line bundles; what do maps to weighted projective space correspond to?
Jul 12 '14 at 13:49
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