28

Answers

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9

Awfully sophisticated proof for simple facts (2)

3

Best online mathematics videos? (2)

34

Suggestions for good notation

13

Most striking applications of category theory?

19

nontrivial theorems with trivial proofs

48

Blackbox Theorems (2)

1

Combinatorial results without known combinatorial proofs

0

When does ‘positive’ imply ‘sum of squares’?

2

Subspaces of finite codimension in Banach spaces

9

Things that should be positive integers…really?

6

Graded local rings versus local rings

3

Applications of the “other” definition of Sheaves

7

Characterizing specific “concrete” mathematical objects by abstract general properties

15

What is the general geometric interpretation of modules in algebraic geometry?

1

Does a locally free sheaf over a product pushforward to a locally free sheaf?

5

Is the direct image of a constant sheaf a constant sheaf?

0

Does the Riemann-Hilbert Correspondence work at the DG level?

8

Can we define homotopy groups using Tannakian categories

7

Unit ideal in non-commutative rings

2

intermediate/middle extension of perverse sheaves

4

moduli problem for flag varieties?

2

Has there been any application of tensor species?

3

Which commutative algebras admit a nonzero Poisson bracket?

1

A_infinity structure on cohomology and the weight filtration

6

Intersection of all normalizers

1

Distinguished triangle of closed - open partition, for D-modules

1

Differential operators on M/G are factor of invariant differential operators on M ? (Quantization commute with reduction ) What is state of art ?

8

Faithfulness of derived functor.