Question

Is it necessary to explicitly state that $\lnot (q \notin X)$ is equivalent to $q \in X$ when writing a proof?

score 48 · Answer 1 · 2026-04-15 21:13:33

48

Views

Is it necessary to explicitly state that $\lnot (q \notin X)$ is equivalent to $q \in X$ when writing a proof?

Published on 15 Apr 2026 - 21:13

score 71 · Answer 2 · 2026-04-16 23:48:10

71

Views

When is a subset called a subset?

Published on 16 Apr 2026 - 23:48

score 330 · Answer 3 · 2026-04-14 19:53:47

330

Views

Use of 'and' and 'or' in Union and intersection of sets.

Published on 14 Apr 2026 - 19:53

score 235 · Answer 4 · 2026-04-14 11:43:24

235

Views

how to use denseness of $\mathbb{Q}$ in this question?

Published on 14 Apr 2026 - 11:43

score 114 · Answer 5 · 2026-04-12 06:30:47

114

Views

On what structural level should one think of $R^3$

Published on 12 Apr 2026 - 6:30

score 771 · Answer 6 · 2026-04-15 21:10:45

771

Views

Intersection of sets of subsets

Published on 15 Apr 2026 - 21:10

score 920 · Answer 7 · 2026-04-10 06:30:56

920

Views

How to understand Cantor's diagonalization method in proving the uncountability of the real numbers?

Published on 10 Apr 2026 - 6:30

score 605 · Answer 8 · 2026-04-13 09:35:43

605

Views

Example of equivalence relation

Published on 13 Apr 2026 - 9:35

score 37 · Answer 9 · 2026-04-15 02:28:07

37

Views

Cartesian product, Could you check me answer?

Published on 15 Apr 2026 - 2:28

score 73 · Answer 10 · 2026-04-16 07:57:18

73

Views

Why Is It That the Number of Subsets of a Set $S$ (the Cardinality of the Power Set of $S$) Is $2^{|S|}$?

Published on 16 Apr 2026 - 7:57

score 51 · Answer 11 · 2026-04-13 20:00:32

51

Views

If $|I|$ < $|J|$ and $(F_i)_{i \in I}$ are finite sets, is $|\cup_{i \in I}F_i| < |J|$?

Published on 13 Apr 2026 - 20:00

score 192 · Answer 12 · 2026-04-15 13:44:47

192

Views

Finite measure of uncountably many disjoint sets implies at least one of them has measure zero?

Published on 15 Apr 2026 - 13:44

score 241 · Answer 13 · 2026-04-15 00:21:46

241

Views

Sequences of von Neumann natural numbers

Published on 15 Apr 2026 - 0:21

score 64 · Answer 14 · 2026-04-14 07:05:34

64

Views

Questions regarding peculiar statement involving empty sets

Published on 14 Apr 2026 - 7:05

score 248 · Answer 15 · 2026-04-11 16:23:06

248

Views

Is $X\times Y$ with lexicographical ordering order-isomorphic with $X\times Y$ with anti-lexicographical ordering?

Published on 11 Apr 2026 - 16:23

List Question

Is it necessary to explicitly state that $\lnot (q \notin X)$ is equivalent to $q \in X$ when writing a proof?

When is a subset called a subset?

Use of 'and' and 'or' in Union and intersection of sets.

how to use denseness of $\mathbb{Q}$ in this question?

On what structural level should one think of $R^3$

Intersection of sets of subsets

How to understand Cantor's diagonalization method in proving the uncountability of the real numbers?

Example of equivalence relation

Cartesian product, Could you check me answer?

Why Is It That the Number of Subsets of a Set $S$ (the Cardinality of the Power Set of $S$) Is $2^{|S|}$?

If $|I|$ < $|J|$ and $(F_i)_{i \in I}$ are finite sets, is $|\cup_{i \in I}F_i| < |J|$?

Finite measure of uncountably many disjoint sets implies at least one of them has measure zero?

Sequences of von Neumann natural numbers

Questions regarding peculiar statement involving empty sets

Is $X\times Y$ with lexicographical ordering order-isomorphic with $X\times Y$ with anti-lexicographical ordering?

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