Sándor Kovács's user avatar
Sándor Kovács's user avatar
Sándor Kovács's user avatar
Sándor Kovács
  • Member for 13 years, 6 months
  • Last seen this week
87 votes
Accepted

Derived Functors Versus Spectral Sequences

79 votes

What elementary problems can you solve with schemes?

55 votes
Accepted

Geometric meaning of Cohen-Macaulay schemes

53 votes
Accepted

The canonical line bundle of a normal variety

42 votes

Why should I believe the Mordell Conjecture?

37 votes

Algebraic machinery for algebraic geometry

36 votes
Accepted

What does the adjective "natural" actually mean?

35 votes

Why must nilpotent elements be allowed in modern algebraic geometry?

34 votes

how does one understand GRR? (Grothendieck Riemann Roch)

34 votes

Higher dimensional version of the Hurwitz formula?

30 votes

Why are noetherian rings such natural objects in algebraic geometry?

28 votes

Flips in the Minimal Model Program

27 votes
Accepted

How "frequent" are smooth projective varieties with (anti-)ample canonical bundle?

25 votes

Given a polynomial f, can there be more than one constant c such that every root of f(x)-c is repeated?

25 votes

Quotient singularities with no crepant resolution?

24 votes
Accepted

Best strategy for small resolutions

23 votes
Accepted

Why does the (S2) property of a ring correspond to the Hartogs phenomenon?

23 votes

What is Serre's condition (S_n) for sheaves?

22 votes
Accepted

Example of a variety with $K_X$ $\mathbb Q$-Cartier but not Cartier

22 votes

When do divisors pull back?

22 votes

flatness in complex analytic geometry

22 votes
Accepted

Vector Bundles on normal surfaces

22 votes
Accepted

k3 surface as ramified double cover of $\mathbb{P}^2$

21 votes
Accepted

Geometry meaning of higher cohomology of sheaves?

21 votes
Accepted

Does there exist a non effective divisor with positive degree?

21 votes

Does the moduli space of smooth curves of genus g contain an elliptic curve

20 votes

Does isomorphic generic fibre imply isomorphic special fibre for smooth morphisms?

19 votes
Accepted

Elliptic curves on abelian surface

19 votes
Accepted

Subtle examples of morphisms that are finite but not flat

19 votes

What information Hilbert polynomial encodes other than dimension, degree and arithmetic genus?

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