chan kifung's user avatar
chan kifung's user avatar
chan kifung's user avatar
chan kifung
  • Member for 8 years, 10 months
  • Last seen more than a month ago
15 votes
1 answer
2k views

Affine variety over a field which is not algebraically closed can be written as the zero set of a single polynomial

8 votes
1 answer
656 views

Linear transformation maps the first quadrant to a closed set

6 votes
1 answer
10k views

How to find the Jordan canonical form of tensor products.

5 votes
2 answers
651 views

Asymptotic Riemann Roch

5 votes
0 answers
202 views

Injective change of ring theorems

5 votes
1 answer
485 views

Representable functor from scheme to Groups

4 votes
1 answer
557 views

Why geometrically irreducible quartic curves in projective plane corresponds to an open subset of projective space of dimension 14

4 votes
1 answer
632 views

Example of a projective variety that is not projectively normal but normal

4 votes
0 answers
753 views

Kunneth formula for group cohomology over a field

4 votes
1 answer
3k views

Inhomogeneous Laplace equation

4 votes
1 answer
732 views

An example when the direct image of a locally free sheaf is not locally free

4 votes
0 answers
45 views

How to compute the map $i^!\to i^*$ for a nilpotent variety.

3 votes
0 answers
107 views

To extend a norm defined on a Banach Algebra to its localization

3 votes
1 answer
2k views

To prove that an ideal cannot be generated by two elements [duplicate]

2 votes
1 answer
1k views

Regular functions extension to normal points of varieties

2 votes
0 answers
123 views

Does Splitting principle hold in the category of schemes?

2 votes
0 answers
102 views

Criterion of separatedness and propernesss

2 votes
0 answers
59 views

Second exact sequence for closed embedding of nonsingular varieties.

1 vote
1 answer
141 views

Equivalent definitions of Hyperkahler manifolds.

1 vote
1 answer
222 views

Lower Bound of the inner product of two semi-positive definite matrix.

1 vote
1 answer
452 views

Intuitive reason why irreducible fibre of same dimension implies irreducibility

1 vote
0 answers
150 views

Finitely presented morphism mean locally base change of finite type morphisms of noetherian schemes

1 vote
1 answer
2k views

Intersection of n hyperplanes in projective space of dimension n is not empty

1 vote
0 answers
355 views

Degree 2 invertible sheaf on curve of positive genus

0 votes
1 answer
290 views

Why a sheaf is coherent

0 votes
1 answer
373 views

Can a valuation ring properly contains another valuation ring with the same field of fractions?

0 votes
1 answer
247 views

The ideal of the image of homogeneous polynomials