Question

Find the cardinality of $\{\{\{1, 4\}, a, b, \{\{3, 4\}\}, \{\emptyset\}\}\}$?

score 458 · Answer 1 · 2026-04-28 18:38:51

458

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Find the cardinality of $\{\{\{1, 4\}, a, b, \{\{3, 4\}\}, \{\emptyset\}\}\}$?

Published on 28 Apr 2026 - 18:38

score 61 · Answer 2 · 2026-04-08 21:25:10

61

Views

Understanding connection of $=$ and $>$ relations in proofs.

Published on 08 Apr 2026 - 21:25

score 4k · Answer 3 · 2026-04-14 16:04:06

4k

Views

A coin is flipped 15 times. How many possible outcomes contain exactly four tails? contain at least three heads?

Published on 14 Apr 2026 - 16:04

score 77 · Answer 4 · 2026-04-16 20:15:32

77

Views

What is Friedberg doing in this proof to show the (ij)th entry of this matrix

Published on 16 Apr 2026 - 20:15

score 64 · Answer 5 · 2026-04-11 07:16:16

64

Views

A falling object does not keep accelerating indefinitely but, due to air resistance, reaches a terminal speed. What is the terminal speed?

Published on 11 Apr 2026 - 7:16

score 642 · Answer 6 · 2026-04-28 20:48:40

642

Views

Doubt about solution to Axler's Linear Algebra Done Right problem

Published on 28 Apr 2026 - 20:48

score 309 · Answer 7 · 2026-03-27 10:47:55

309

Views

Fenchel conjugate of convex combination of two norms

Published on 27 Mar 2026 - 10:47

score 65 · Answer 8 · 2026-04-12 04:32:30

65

Views

Proof by contradicion

Published on 12 Apr 2026 - 4:32

score 326 · Answer 9 · 2026-04-23 16:56:58

326

Views

How to prove that $\frac{\cosh (2 \pi x)}{x^2}$ is convex?

Published on 23 Apr 2026 - 16:56

score 36 · Answer 10 · 2026-04-12 00:36:01

36

Views

Problem in efficiency of two test statistic for 2-sample case

Published on 12 Apr 2026 - 0:36

score 76 · Answer 11 · 2026-04-28 22:08:06

76

Views

Prove that $G$ is not an open set in $\mathbb R^2$

Published on 28 Apr 2026 - 22:08

score 72 · Answer 12 · 2026-04-14 00:34:45

72

Views

Is the statement "$a^2 = b$ and $b > 0$, then $a=\sqrt{b}$" true or false?

Published on 14 Apr 2026 - 0:34

score 56 · Answer 13 · 2026-04-15 18:11:18

56

Views

Is the statement "$p$ implies $q$" logically equivalent to the statement "$p$ implies only $q$"?

Published on 15 Apr 2026 - 18:11

score 81 · Answer 14 · 2026-04-12 17:44:13

81

Views

understanding proof of $P_i(T_j<\infty) =1$ for recurrent states $i,j$ in irreducible Markov chain by Norris

Published on 12 Apr 2026 - 17:44

score 122 · Answer 15 · 2026-04-29 01:01:32

122

Views

Proof of $p \in \mathbb{R}_{+}$ then $\lim_{n \to \infty} \frac{1}{n^{p}} = 0$

Published on 29 Apr 2026 - 1:01

List Question

Find the cardinality of $\{\{\{1, 4\}, a, b, \{\{3, 4\}\}, \{\emptyset\}\}\}$?

Understanding connection of $=$ and $>$ relations in proofs.

A coin is flipped 15 times. How many possible outcomes contain exactly four tails? contain at least three heads?

What is Friedberg doing in this proof to show the (ij)th entry of this matrix

A falling object does not keep accelerating indefinitely but, due to air resistance, reaches a terminal speed. What is the terminal speed?

Doubt about solution to Axler's Linear Algebra Done Right problem

Fenchel conjugate of convex combination of two norms

Proof by contradicion

How to prove that $\frac{\cosh (2 \pi x)}{x^2}$ is convex?

Problem in efficiency of two test statistic for 2-sample case

Prove that $G$ is not an open set in $\mathbb R^2$

Is the statement "$a^2 = b$ and $b > 0$, then $a=\sqrt{b}$" true or false?

Is the statement "$p$ implies $q$" logically equivalent to the statement "$p$ implies only $q$"?

understanding proof of $P_i(T_j<\infty) =1$ for recurrent states $i,j$ in irreducible Markov chain by Norris

Proof of $p \in \mathbb{R}_{+}$ then $\lim_{n \to \infty} \frac{1}{n^{p}} = 0$

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