Question

Question about injective and surjective functions - Tao's Analysis exercise 3.3.5

score 99 · Answer 1 · 2020-05-06 17:32:53

99

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Question about injective and surjective functions - Tao's Analysis exercise 3.3.5

Published on 06 May 2020 - 17:32

score 690 · Answer 2 · 2026-03-26 21:54:01

690

Views

The Chow ring of affine space

Published on 26 Mar 2026 - 21:54

score 303 · Answer 3 · 2020-05-06 18:54:09

303

Views

Cancellation law for function inverses - Tao Exercise 3.3.6

Published on 06 May 2020 - 18:54

score 125 · Answer 4 · 2020-05-06 19:53:55

125

Views

Proof verification: $(x_n)\rightarrow c$ $\implies$ $f(x_n) \rightarrow L$ iff $\lim_{x \rightarrow c} = L$

Published on 06 May 2020 - 19:53

score 99 · Answer 5 · 2020-05-06 21:46:12

99

Views

Proof verification: $M \cap N \subseteq M$ and $M \subseteq M \cup N$

Published on 06 May 2020 - 21:46

score 39 · Answer 6 · 2020-05-06 22:01:26

39

Views

Alternate Proof that for A, B disjoint, A compact and B closed there is positive distance between the sets.

Published on 06 May 2020 - 22:01

score 1k · Answer 7 · 2026-04-01 15:42:31

1k

Views

Proving speed is constant if the velocity and acceleration vectors are perpendicular.

Published on 01 Apr 2026 - 15:42

score 110 · Answer 8 · 2026-03-31 22:09:57

110

Views

Square root of prime is irrational. Is this a valid proof?

Published on 31 Mar 2026 - 22:09

score 57 · Answer 9 · 2020-05-07 01:32:51

57

Views

Proof verification: $\frac{1}{1}+\frac{1}{2}+\cdots+\frac{1}{n}\not\in \mathbb{N}$ for $n\geq 2$

Published on 07 May 2020 - 1:32

score 40 · Answer 10 · 2026-03-30 00:59:29

40

Views

Any complex $2\times 2$ matrix is of one of the two forms: proof.

Published on 30 Mar 2026 - 0:59

score 226 · Answer 11 · 2026-03-25 09:49:22

226

Views

Prove that $G(\mathbb{Q}(\zeta)/\mathbb{Q}) $ and $\mathbb{Z}_n^\times$ are Isomorphic

Published on 25 Mar 2026 - 9:49

score 80 · Answer 12 · 2026-04-07 00:41:30

80

Views

Show that $A$ is positive definite via the Cholesky decomposition

Published on 07 Apr 2026 - 0:41

score 50 · Answer 13 · 2026-04-09 17:00:33

50

Views

Does an inequality for functions hold if it does for their integrals?

Published on 09 Apr 2026 - 17:00

score 123 · Answer 14 · 2026-03-27 18:27:58

123

Views

Is it true or can it be proven that $\frac{n}{\varphi(n)} \geq \operatorname{rad}(n)$?

Published on 27 Mar 2026 - 18:27

score 1k · Answer 15 · 2020-05-07 06:17:36

1k

Views

Prove that if $f$ is continuous and $f(x)=0$ for all $x<0$ then $f(0)=0$

Published on 07 May 2020 - 6:17

List Question

Question about injective and surjective functions - Tao's Analysis exercise 3.3.5

The Chow ring of affine space

Cancellation law for function inverses - Tao Exercise 3.3.6

Proof verification: $(x_n)\rightarrow c$ $\implies$ $f(x_n) \rightarrow L$ iff $\lim_{x \rightarrow c} = L$

Proof verification: $M \cap N \subseteq M$ and $M \subseteq M \cup N$

Alternate Proof that for A, B disjoint, A compact and B closed there is positive distance between the sets.

Proving speed is constant if the velocity and acceleration vectors are perpendicular.

Square root of prime is irrational. Is this a valid proof?

Proof verification: $\frac{1}{1}+\frac{1}{2}+\cdots+\frac{1}{n}\not\in \mathbb{N}$ for $n\geq 2$

Any complex $2\times 2$ matrix is of one of the two forms: proof.

Prove that $G(\mathbb{Q}(\zeta)/\mathbb{Q}) $ and $\mathbb{Z}_n^\times$ are Isomorphic

Show that $A$ is positive definite via the Cholesky decomposition

Does an inequality for functions hold if it does for their integrals?

Is it true or can it be proven that $\frac{n}{\varphi(n)} \geq \operatorname{rad}(n)$?

Prove that if $f$ is continuous and $f(x)=0$ for all $x<0$ then $f(0)=0$

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