User Owen Biesel

43 votes

7 answers

8k views

Why are free groups residually finite?

asked Apr 6, 2010 at 3:53

19 votes

1 answer

618 views

If $B\subseteq A$ are free & finite rank $R$-algebras, is $R\to A \otimes_B R$ injective?

asked Aug 29, 2014 at 20:57

11 votes

2 answers

2k views

Generalizing the Fundamental Theorem of Symmetric Polynomials

asked Feb 23, 2012 at 21:58

9 votes

2 answers

540 views

When can one extend a flat family from a subscheme to the whole scheme?

asked Sep 30, 2010 at 18:03

9 votes

1 answer

659 views

Is $G$ always the automorphism group of the trivial $G$-torsor?

asked Dec 8, 2016 at 17:05

8 votes

1 answer

2k views

Is a projective module of constant finite rank finitely generated?

asked Aug 14, 2014 at 10:45

8 votes

0 answers

153 views

Is 2 a zerodivisor in the ring parametrizing rank-n algebras?

asked Aug 29, 2012 at 18:01

7 votes

4 answers

501 views

Does $S$ being a free rank-$n$ $R$-algebra imply that $S/R$ is free rank $n-1$?

asked Feb 20, 2012 at 19:53

5 votes

1 answer

320 views

Prime-like elements of rings

asked Aug 18, 2012 at 18:13

5 votes

2 answers

444 views

For a finite-type $\mathbb{Z}$-algebra $A$, is the intersection of all ideals $I$ such that $A/I$ is finite and local necessarily zero?

asked Sep 13, 2022 at 19:56

5 votes

1 answer

125 views

Identity relating iterated determinant line bundles

asked Dec 19, 2020 at 15:31

4 votes

2 answers

266 views

Reference for (co)limit-preserving functor $X\mapsto R^X$

asked Aug 1, 2015 at 3:10

3 votes

3 answers

436 views

When is this diagram of tensor powers an equalizer?

asked Sep 1, 2012 at 21:41

3 votes

1 answer

212 views

Is a tower of locally-free modules locally a tower of free modules?

asked Jan 27, 2021 at 17:49

3 votes

1 answer

412 views

Torsors of pushforward group schemes

asked Dec 4, 2017 at 19:28

3 votes

0 answers

77 views

Reference Request: Is every interval-valued probability measure consistent?

asked Aug 12, 2020 at 20:17

Stack Exchange Network

16 Questions

Why are free groups residually finite?

If $B\subseteq A$ are free & finite rank $R$-algebras, is $R\to A \otimes_B R$ injective?

Generalizing the Fundamental Theorem of Symmetric Polynomials

When can one extend a flat family from a subscheme to the whole scheme?

Is $G$ always the automorphism group of the trivial $G$-torsor?

Is a projective module of constant finite rank finitely generated?

Is 2 a zerodivisor in the ring parametrizing rank-n algebras?

Does $S$ being a free rank-$n$ $R$-algebra imply that $S/R$ is free rank $n-1$?

Prime-like elements of rings

For a finite-type $\mathbb{Z}$-algebra $A$, is the intersection of all ideals $I$ such that $A/I$ is finite and local necessarily zero?

Identity relating iterated determinant line bundles

Reference for (co)limit-preserving functor $X\mapsto R^X$

When is this diagram of tensor powers an equalizer?

Is a tower of locally-free modules locally a tower of free modules?

Torsors of pushforward group schemes

Reference Request: Is every interval-valued probability measure consistent?