User Eric Wofsey

16 votes

Accepted

Is this space the Stone–Čech compactification?

answered Dec 31, 2021 at 19:36

8 votes

Using Axiom of Replacement to construct the set of sets that are indexed by a set

answered Dec 19, 2020 at 20:51

8 votes

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One-dimensional scheme with no closed points

answered Apr 17, 2019 at 16:24

17 votes

Circular, or missing, definition in set theory?

answered May 24, 2018 at 17:53

16 votes

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Commutative algebra counterexample

answered May 2, 2018 at 1:24

19 votes

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On the homotopy type of $\mathbb{QP}^\infty$

answered Dec 22, 2017 at 21:12

6 votes

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Classification of $C^*$ algebras whose all non scalar elements have disconnected spectrum

answered Jul 3, 2017 at 7:42

23 votes

When $X \times Y \cong X \times Z$ implies $Y \cong Z$ (in the category of finite topological spaces)

answered May 11, 2017 at 20:40

16 votes

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Artin Rings, Noetherian Rings, and the Axiom of Choice

answered Apr 15, 2017 at 21:51

3 votes

Existence of "Continuous paths" in categories as directed systems

answered Apr 15, 2017 at 21:39

4 votes

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Is the minimal Serre subcategory containing a set also a set?

answered Jan 25, 2017 at 19:39

5 votes

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Do copowers commute with k-linear functors?

answered Aug 6, 2016 at 19:31

3 votes

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Projective resolutions of torsion modules

answered Apr 11, 2016 at 5:57

4 votes

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What does the notation $[b_1,b_2]$ in M. Hochster's "Prime Ideal Structure in Commutative Rings" mean?

answered Mar 29, 2016 at 1:12

19 votes

Does the functor Sch to Top have a right adjoint?

answered Feb 19, 2016 at 19:24

2 votes

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About equalizer of Boolean algebras

answered Feb 3, 2016 at 8:26

20 votes

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Description of $\big(\ell^\infty(\mathbb N)\big)^{\!*}$ via ultrafilters

answered Feb 1, 2016 at 12:38

8 votes

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Partial Orders realized by Prime Ideals on commutative rings

answered Jan 29, 2016 at 12:42

11 votes

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Who gave the generalized Stone-Weierstrass Theorem?

answered Jan 25, 2016 at 21:25

13 votes

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Does "$|{\cal P}_2(X)| = |X|$ for $X$ infinite" imply ${\sf (AC)}$?

answered Jan 12, 2016 at 8:26

6 votes

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Darboux property of non-atomic sigma-additive nonnegative measures equivalent to the AC?

answered Dec 9, 2015 at 19:39

16 votes

Spectrum of Ring of Smooth Functions on $\mathbb{R}^n$

answered Nov 30, 2015 at 18:13

2 votes

Complement of a finite union of convex sets

answered Nov 23, 2015 at 0:01

2 votes

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Does this version of Hadwiger's conjecture hold for graphs with infinite chromatic number?

answered Oct 23, 2015 at 20:13

25 votes

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Which partitions of $[0,1]$ are collection of level sets of a real continuous function?

answered Oct 8, 2015 at 14:59

6 votes

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In a noetherian commutative ring with only one associated prime, is the nilradical locally free?

answered Oct 7, 2015 at 20:46

12 votes

When does $R [x]/I $ has infinitely many idempotents?

answered Oct 3, 2015 at 19:12

9 votes

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Pontryagin dual of the surreal numbers?

answered Sep 23, 2015 at 23:25

6 votes

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For a simplicial set $X$, is the category of non-degenerate simplices of $X$ a full subcategory of the category of simplices of $X$?

answered Sep 19, 2015 at 15:51

3 votes

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Are maps homotopic with respect to a uniform number of local homotopies

answered Sep 9, 2015 at 2:33

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265 Answers

Is this space the Stone–Čech compactification?

Using Axiom of Replacement to construct the set of sets that are indexed by a set

One-dimensional scheme with no closed points

Circular, or missing, definition in set theory?

Commutative algebra counterexample

On the homotopy type of $\mathbb{QP}^\infty$

Classification of $C^*$ algebras whose all non scalar elements have disconnected spectrum

When $X \times Y \cong X \times Z$ implies $Y \cong Z$ (in the category of finite topological spaces)

Artin Rings, Noetherian Rings, and the Axiom of Choice

Existence of "Continuous paths" in categories as directed systems

Is the minimal Serre subcategory containing a set also a set?

Do copowers commute with k-linear functors?

Projective resolutions of torsion modules

What does the notation $[b_1,b_2]$ in M. Hochster's "Prime Ideal Structure in Commutative Rings" mean?

Does the functor Sch to Top have a right adjoint?

About equalizer of Boolean algebras

Description of $\big(\ell^\infty(\mathbb N)\big)^{\!*}$ via ultrafilters

Partial Orders realized by Prime Ideals on commutative rings

Who gave the generalized Stone-Weierstrass Theorem?

Does "$|{\cal P}_2(X)| = |X|$ for $X$ infinite" imply ${\sf (AC)}$?

Darboux property of non-atomic sigma-additive nonnegative measures equivalent to the AC?

Spectrum of Ring of Smooth Functions on $\mathbb{R}^n$

Complement of a finite union of convex sets

Does this version of Hadwiger's conjecture hold for graphs with infinite chromatic number?

Which partitions of $[0,1]$ are collection of level sets of a real continuous function?

In a noetherian commutative ring with only one associated prime, is the nilradical locally free?

When does $R [x]/I $ has infinitely many idempotents?

Pontryagin dual of the surreal numbers?

For a simplicial set $X$, is the category of non-degenerate simplices of $X$ a full subcategory of the category of simplices of $X$?

Are maps homotopic with respect to a uniform number of local homotopies