User mathlearner98 - Mathematics Stack Exchange

7 votes

0 answers

370 views

Counter example to Ryll-Nardzewski

asked Nov 17, 2023 at 5:23

5 votes

2 answers

362 views

Proving without the Axiom of Choice (A.C.) that increasing real functions have countable discontinuities

asked Feb 18, 2022 at 23:11

5 votes

1 answer

165 views

Question on Gale-Stewart Theorem and Axiom of Choice

asked Oct 17, 2022 at 19:59

4 votes

0 answers

145 views

Alternate proof of Sylow's First theorem.

asked Mar 14, 2022 at 21:17

4 votes

1 answer

177 views

Konig's tree lemma without using axiom of dependent choice

asked Sep 20, 2022 at 19:42

4 votes

0 answers

122 views

Prime Ideal Theorem implies Hahn Banach Theorem

asked Feb 1, 2023 at 7:58

3 votes

1 answer

116 views

In ZF, is it possible that there is no cardinal such that Reals injects into?

asked Jan 20, 2022 at 6:34

3 votes

1 answer

169 views

Questions about evaluation map from $\mathbb Z[[X]]$ to $\mathbb Q$ and $\mathbb Z[[X]]$ to $\mathbb C$.

asked Feb 21, 2020 at 6:44

3 votes

1 answer

133 views

Riemann integrability of $f(x)*e^{-inx}$ when f is L2 integrable.

asked Mar 6, 2020 at 2:36

3 votes

0 answers

373 views

Solving dimension of an affine algebraic variety.

asked Oct 17, 2020 at 23:39

2 votes

1 answer

259 views

Proving Compactness Theorem

asked Oct 25, 2021 at 22:09

2 votes

1 answer

92 views

Proving that product of two-point sets is compact

asked Jan 27, 2023 at 4:45

1 vote

0 answers

60 views

What is the definition of algorithm and recursive theory in logic?

asked Feb 14, 2022 at 18:38

1 vote

1 answer

108 views

Explicitly constructing a non determined game on $\mathcal{P}(2^{\mathbb{N}})$

asked Nov 2, 2022 at 18:40

1 vote

0 answers

37 views

Countable dense subset of Cantor space isn't Wadge reducible to its complement

asked Dec 23, 2022 at 0:16

1 vote

2 answers

138 views

Example of a complete unbounded dense linearly ordered set that isn't isomorphic to $\mathbb{R}$

asked Dec 31, 2022 at 3:01

1 vote

1 answer

106 views

Cardinal inequality question used in Silver's theorem proof

asked Jan 22, 2023 at 3:44

1 vote

1 answer

56 views

Cardinal inequality question used in proof of Silver's theorem [duplicate]

asked Jan 23, 2023 at 7:16

1 vote

0 answers

42 views

Is there any algebraic way to "invert" a module?

asked Nov 24, 2021 at 3:49

1 vote

2 answers

117 views

Quick question about inaccessible cardinals

asked Dec 5, 2021 at 8:53

1 vote

0 answers

45 views

Distinguishing randomness and pseudo randomness

asked May 26, 2021 at 18:30

1 vote

2 answers

268 views

Are provable statements true?

asked Oct 22, 2021 at 2:44

1 vote

1 answer

115 views

Real Analysis: viewing infinity as the end

asked Apr 12, 2019 at 21:09

1 vote

1 answer

51 views

real analysis: uniform convergence of sequence of functions.

asked Jun 12, 2019 at 22:19

0 votes

1 answer

102 views

Finding the possible kernels of homomorphisms $\mathbb{Z} \to \mathbb{Z}$.

asked Oct 13, 2019 at 0:57

0 votes

1 answer

378 views

Existence of Ring homomorphism from Formal Power series ring to a ring.

asked Feb 21, 2020 at 3:12

0 votes

2 answers

52 views

Existence of ring homomorphism from $\mathbb{Z}[[x]] \to \mathbb{Z} $ [closed]

asked Mar 19, 2020 at 0:09

0 votes

1 answer

136 views

Evaluating one integral

asked Mar 3, 2020 at 23:46

0 votes

1 answer

346 views

Showing two rings are not isomorphic [closed]

asked Oct 29, 2020 at 22:45

0 votes

1 answer

107 views

How do I prove Separation Schema within ZFC?

asked Dec 7, 2021 at 6:19

Stack Exchange Network

38 Questions

Counter example to Ryll-Nardzewski

Proving without the Axiom of Choice (A.C.) that increasing real functions have countable discontinuities

Question on Gale-Stewart Theorem and Axiom of Choice

Alternate proof of Sylow's First theorem.

Konig's tree lemma without using axiom of dependent choice

Prime Ideal Theorem implies Hahn Banach Theorem

In ZF, is it possible that there is no cardinal such that Reals injects into?

Questions about evaluation map from $\mathbb Z[[X]]$ to $\mathbb Q$ and $\mathbb Z[[X]]$ to $\mathbb C$.

Riemann integrability of $f(x)*e^{-inx}$ when f is L2 integrable.

Solving dimension of an affine algebraic variety.

Proving Compactness Theorem

Proving that product of two-point sets is compact

What is the definition of algorithm and recursive theory in logic?

Explicitly constructing a non determined game on $\mathcal{P}(2^{\mathbb{N}})$

Countable dense subset of Cantor space isn't Wadge reducible to its complement

Example of a complete unbounded dense linearly ordered set that isn't isomorphic to $\mathbb{R}$

Cardinal inequality question used in Silver's theorem proof

Cardinal inequality question used in proof of Silver's theorem [duplicate]

Is there any algebraic way to "invert" a module?

Quick question about inaccessible cardinals

Distinguishing randomness and pseudo randomness

Are provable statements true?

Real Analysis: viewing infinity as the end

real analysis: uniform convergence of sequence of functions.

Finding the possible kernels of homomorphisms $\mathbb{Z} \to \mathbb{Z}$.

Existence of Ring homomorphism from Formal Power series ring to a ring.

Existence of ring homomorphism from $\mathbb{Z}[[x]] \to \mathbb{Z} $ [closed]

Evaluating one integral

Showing two rings are not isomorphic [closed]

How do I prove Separation Schema within ZFC?