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user104235
  • Member for 10 years, 5 months
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53 votes
8 answers
79k views

$\sqrt x$ is uniformly continuous

14 votes
2 answers
12k views

If $|G| = p^n$ then $G$ has a subgroup of order $p^m$ for all $0\le m <n.$

14 votes
2 answers
19k views

Closed ball is not compact

14 votes
1 answer
30k views

Conjugate class in the dihedral group

10 votes
3 answers
8k views

Without using Sylow: Group of order 28 has a normal subgroup of order 7

8 votes
4 answers
5k views

Continuous, bijective function from $f:[0,1)\to \mathbb{R}.$

4 votes
2 answers
134 views

Automorphism proof

4 votes
1 answer
458 views

Improper integral and existence

3 votes
1 answer
318 views

Radius of convergence proof

3 votes
3 answers
453 views

Continuous map from $[0,1]$ to $[0,1].$

2 votes
2 answers
11k views

Polynomial functions of odd degree are surjective

2 votes
2 answers
305 views

Uniformly convergent

2 votes
2 answers
2k views

Inner automorphisms of $S_3$

2 votes
2 answers
766 views

Prove that G is not simple

2 votes
1 answer
4k views

Product of two uniformly convergent sequences

2 votes
1 answer
112 views

If partials exist and are continuous then they are equal

2 votes
1 answer
926 views

Find the three 2-Sylow subgroups of $S_3$ and find a 2-Sylow subgroup and a 3-Sylow subgroup of $S_4$

2 votes
1 answer
160 views

The range of continuous functions and the Intermediate value theorem

2 votes
1 answer
1k views

Riemann integral proof $\int^b_a f(x) \, dx>0$

1 vote
1 answer
309 views

Irreducible over the field

1 vote
1 answer
298 views

Separation of variables won't work

1 vote
2 answers
2k views

Riemann integral proof

1 vote
2 answers
10k views

Strictly increasing continuous function

1 vote
2 answers
557 views

Mean value theorem and differentiability

1 vote
1 answer
130 views

Getting better at proving continuity

1 vote
1 answer
315 views

Centralizer is nontrivial

1 vote
1 answer
64 views

Normalizer proof

1 vote
2 answers
222 views

Prove that D is normal

1 vote
1 answer
70 views

Restriction of $f$ to $B(x_0,\delta)$ attains a maximum

1 vote
2 answers
508 views

Differentiable function is nonnegative