Question

Proof that the order of quantifiers doesn't matter (what went wrong)?

score 149 · Answer 1 · 2026-04-14 13:33:37

149

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Proof that the order of quantifiers doesn't matter (what went wrong)?

Published on 14 Apr 2026 - 13:33

score 120 · Answer 2 · 2026-04-13 00:15:47

120

Views

if $A$ is a square matrix and $A^2 =0$, then $(I-A)$ is invertible

Published on 13 Apr 2026 - 0:15

score 39 · Answer 3 · 2026-04-15 18:53:16

39

Views

Proof verification for $\vdash_{TA} (p \rightarrow q) \rightarrow ((r \rightarrow p) \rightarrow (r \rightarrow p))$

Published on 15 Apr 2026 - 18:53

score 68 · Answer 4 · 2026-04-09 09:16:11

68

Views

Exercise 15, Section 7.2 of Hoffman’s Linear Algebra

Published on 09 Apr 2026 - 9:16

score 37 · Answer 5 · 2026-04-12 22:34:25

37

Views

Can you expand the same formula in different branches in the method of analytic tableaux?

Published on 12 Apr 2026 - 22:34

score 2.4k · Answer 6 · 2026-04-15 07:24:24

2.4k

Views

Why do I get two different answers while doing this simple limit math?

Published on 15 Apr 2026 - 7:24

score 122 · Answer 7 · 2026-04-15 04:43:38

122

Views

Is this the correct way to prove a sigma algebra?

Published on 15 Apr 2026 - 4:43

score 205 · Answer 8 · 2026-04-18 04:00:59

205

Views

Consider the function $f(x)=\lim_{n\to \infty}\frac {\log_e(2+x)-x^{2n}\sin x}{1+x^{2n}},x>0.$ Is $f(x)$ continuous at $x=1$ ? Justify your answer

Published on 18 Apr 2026 - 4:00

score 44 · Answer 9 · 2026-04-10 08:00:30

44

Views

Verifying a solution for a Second Order Differential Equation

Published on 10 Apr 2026 - 8:00

score 309 · Answer 10 · 2026-04-16 20:01:48

309

Views

Prove there exists a $ c $ such that $ f(c) = g(c) $

Published on 16 Apr 2026 - 20:01

score 31 · Answer 11 · 2026-04-10 21:32:17

31

Views

A bit stuck on a quite simple proof that involves the floor value of two parameters

Published on 10 Apr 2026 - 21:32

score 155 · Answer 12 · 2026-04-13 23:08:01

155

Views

Exercise 4 on p.38 in Exercises 2B in "Measure, Integration & Real Analysis" by Sheldon Axler. Is my solution ok?

Published on 13 Apr 2026 - 23:08

score 97 · Answer 13 · 2026-04-24 14:43:25

97

Views

Proof verification: if $a_n=\Omega(C^n)$ as $n\to\infty$ for every $C>1$, then $a_n=\omega(C^n)$ as $n\to\infty$.

Published on 24 Apr 2026 - 14:43

score 36 · Answer 14 · 2026-04-16 05:45:57

36

Views

Proving $C = \{ x \in \mathbb R^n\colon Ax = b\}$is closed, for some $A \in \mathbb R^{m \times n}$ and $b \in \mathbb R^m$ s.t. system is feasible.

Published on 16 Apr 2026 - 5:45

score 35 · Answer 15 · 2026-03-26 17:34:52

35

Views

Compute divergence of a matrix

Published on 26 Mar 2026 - 17:34

List Question

Proof that the order of quantifiers doesn't matter (what went wrong)?

if $A$ is a square matrix and $A^2 =0$, then $(I-A)$ is invertible

Proof verification for $\vdash_{TA} (p \rightarrow q) \rightarrow ((r \rightarrow p) \rightarrow (r \rightarrow p))$

Exercise 15, Section 7.2 of Hoffman’s Linear Algebra

Can you expand the same formula in different branches in the method of analytic tableaux?

Why do I get two different answers while doing this simple limit math?

Is this the correct way to prove a sigma algebra?

Consider the function $f(x)=\lim_{n\to \infty}\frac {\log_e(2+x)-x^{2n}\sin x}{1+x^{2n}},x>0.$ Is $f(x)$ continuous at $x=1$ ? Justify your answer

Verifying a solution for a Second Order Differential Equation

Prove there exists a $ c $ such that $ f(c) = g(c) $

A bit stuck on a quite simple proof that involves the floor value of two parameters

Exercise 4 on p.38 in Exercises 2B in "Measure, Integration & Real Analysis" by Sheldon Axler. Is my solution ok?

Proof verification: if $a_n=\Omega(C^n)$ as $n\to\infty$ for every $C>1$, then $a_n=\omega(C^n)$ as $n\to\infty$.

Proving $C = \{ x \in \mathbb R^n\colon Ax = b\}$is closed, for some $A \in \mathbb R^{m \times n}$ and $b \in \mathbb R^m$ s.t. system is feasible.

Compute divergence of a matrix

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