User Seth

30 votes

5 answers

2k views

Can two topological spaces surject onto each other but not be homeomorphic?

asked Jul 11, 2012 at 13:40

20 votes

2 answers

4k views

Do differentiable functions preserve measure zero sets? Measurable sets?

asked Jul 16, 2014 at 1:54

13 votes

1 answer

2k views

Hartshorne II prop 6.6

asked Oct 15, 2014 at 20:41

13 votes

1 answer

683 views

Hartshorne II prop 6.9

asked Oct 16, 2014 at 20:43

13 votes

1 answer

6k views

Conformal map from punctured disc to disc

asked Aug 22, 2012 at 23:57

12 votes

1 answer

444 views

Proof of holomorphic Lefschetz fixed point formula using currents in Griffiths and Harris

asked Nov 24, 2014 at 15:44

8 votes

3 answers

3k views

Prove there is a unique continuous function satisfying this integral equation

asked Jun 4, 2013 at 20:24

8 votes

1 answer

387 views

Is there a nonempty open bounded subset of plane whose boundary contains no 1 dimensional interval?

asked Mar 20, 2014 at 19:42

7 votes

1 answer

2k views

Why would we expect the pushforward to encode the total derivative of a smooth map?

asked Oct 16, 2012 at 23:03

7 votes

1 answer

3k views

What does it mean geometrically for a variety to be locally a complete intersection?

asked Mar 26, 2014 at 0:04

7 votes

0 answers

263 views

Vanishing of Tor sheaf on a union of subschemes with vanishing Tor.

asked Dec 4, 2015 at 23:01

5 votes

1 answer

1k views

Is a coherent locally free sheaf isomorphic it's dual?

asked Oct 11, 2014 at 21:38

5 votes

3 answers

1k views

Understanding why nonsingular complex algebraic varieties are analytic manifolds.

asked Mar 21, 2014 at 21:48

5 votes

2 answers

431 views

Atiyah Macdonald Chapter 3 Problem 23 Part ii)

asked Oct 3, 2013 at 21:35

4 votes

1 answer

2k views

Some technical details about regular functions on quasiprojective varieties

asked Feb 22, 2014 at 17:22

4 votes

1 answer

3k views

Bijective conformal map from half disc to upper half plane

asked May 31, 2013 at 20:03

4 votes

1 answer

720 views

Application of Lefschetz duality to prove Lefschetz hyperplane theorem

asked Mar 15, 2014 at 2:32

4 votes

1 answer

89 views

How do I show that the product of two monoidal objects is a monoidal object?

asked May 30, 2012 at 22:51

4 votes

2 answers

998 views

Understanding cofree coalgebras

asked Jun 11, 2012 at 18:51

4 votes

2 answers

756 views

Hartshorne II Prop 6.8

asked Oct 17, 2014 at 13:52

4 votes

0 answers

346 views

Reference request: classification of simple Lie groups and simple real Lie algebras

asked Nov 16, 2014 at 21:07

4 votes

2 answers

745 views

Generators for (radical) ideal of product of affine varieties

asked Mar 29, 2014 at 11:51

4 votes

2 answers

562 views

Why is $[\widetilde{v},\widetilde{w}]_p(f)=0$ when $f$ has a critical point at $p$?

asked Apr 17, 2014 at 23:10

4 votes

1 answer

733 views

Exercise 3.20 in Hartshorne on dimension of integral schemes of finite type over a field.

asked Sep 6, 2014 at 20:16

4 votes

1 answer

1k views

Hartshorne Chapter II exercise 5.7 on Invertible sheaves

asked Oct 10, 2014 at 18:21

4 votes

2 answers

1k views

Computing the Grothendieck group of affine space.

asked Feb 26, 2015 at 19:14

4 votes

2 answers

562 views

What is meant by "A and B represent the same functor whence are isomorphic" in this solution?

asked Mar 4, 2015 at 19:44

4 votes

2 answers

2k views

How does extension of restriction of $M$ relate to $M$?

asked Apr 23, 2016 at 16:53

3 votes

0 answers

300 views

Pullback of sheaf of a divisor by a desingularization mod torsion.

asked Mar 6, 2016 at 19:23

3 votes

1 answer

633 views

Hartshorne III 9.5 confused about base extension.

asked Mar 14, 2015 at 19:58

Stack Exchange Network

46 Questions

Can two topological spaces surject onto each other but not be homeomorphic?

Do differentiable functions preserve measure zero sets? Measurable sets?

Hartshorne II prop 6.6

Hartshorne II prop 6.9

Conformal map from punctured disc to disc

Proof of holomorphic Lefschetz fixed point formula using currents in Griffiths and Harris

Prove there is a unique continuous function satisfying this integral equation

Is there a nonempty open bounded subset of plane whose boundary contains no 1 dimensional interval?

Why would we expect the pushforward to encode the total derivative of a smooth map?

What does it mean geometrically for a variety to be locally a complete intersection?

Vanishing of Tor sheaf on a union of subschemes with vanishing Tor.

Is a coherent locally free sheaf isomorphic it's dual?

Understanding why nonsingular complex algebraic varieties are analytic manifolds.

Atiyah Macdonald Chapter 3 Problem 23 Part ii)

Some technical details about regular functions on quasiprojective varieties

Bijective conformal map from half disc to upper half plane

Application of Lefschetz duality to prove Lefschetz hyperplane theorem

How do I show that the product of two monoidal objects is a monoidal object?

Understanding cofree coalgebras

Hartshorne II Prop 6.8

Reference request: classification of simple Lie groups and simple real Lie algebras

Generators for (radical) ideal of product of affine varieties

Why is $[\widetilde{v},\widetilde{w}]_p(f)=0$ when $f$ has a critical point at $p$?

Exercise 3.20 in Hartshorne on dimension of integral schemes of finite type over a field.

Hartshorne Chapter II exercise 5.7 on Invertible sheaves

Computing the Grothendieck group of affine space.

What is meant by "A and B represent the same functor whence are isomorphic" in this solution?

How does extension of restriction of $M$ relate to $M$?

Pullback of sheaf of a divisor by a desingularization mod torsion.

Hartshorne III 9.5 confused about base extension.