Question

proof there are exactly $\mathfrak c$ open sets in $\mathbb R$

score 112 · Answer 1 · 2019-12-12 07:40:33

112

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proof there are exactly $\mathfrak c$ open sets in $\mathbb R$

Published on 12 Dec 2019 - 7:40

score 38 · Answer 2 · 2019-12-12 13:25:50

38

Views

Prove that an interval of rationals has the same cardinality as the rationals

Published on 12 Dec 2019 - 13:25

score 157 · Answer 3 · 2026-03-28 17:41:13

157

Views

The Ulam matrix and the definition of measurable cardinals.

Published on 28 Mar 2026 - 17:41

score 215 · Answer 4 · 2019-12-15 16:27:07

215

Views

Why are the cardinalities of direct and inverse limits of $\mathbb{Z}/p^k\mathbb{Z}$ different?

Published on 15 Dec 2019 - 16:27

score 99 · Answer 5 · 2019-12-16 15:54:04

99

Views

Augmented cardinal logarithm of the continuum

Published on 16 Dec 2019 - 15:54

score 61 · Answer 6 · 2019-12-16 17:02:58

61

Views

About sub-factors of real numbers

Published on 16 Dec 2019 - 17:02

score 160 · Answer 7 · 2019-12-18 04:16:26

160

Views

Proof: The cardinalities of two sets cannot be smaller than each other.

Published on 18 Dec 2019 - 4:16

score 183 · Answer 8 · 2026-03-27 19:33:19

183

Views

Cardinality of a subset of an ordinal

Published on 27 Mar 2026 - 19:33

score 55 · Answer 9 · 2019-12-19 12:20:51

55

Views

Trouble proving that $\mathbb{R} \approx \textbf{I} $

Published on 19 Dec 2019 - 12:20

score 94 · Answer 10 · 2019-12-19 12:58:20

94

Views

Covering of uncountable cardinal

Published on 19 Dec 2019 - 12:58

score 62 · Answer 11 · 2019-12-20 14:17:10

62

Views

Cardinal inequality

Published on 20 Dec 2019 - 14:17

score 51 · Answer 12 · 2019-12-21 23:01:58

51

Views

Is this use of bijections for comparing infinite cardinalities correct?

Published on 21 Dec 2019 - 23:01

score 77 · Answer 13 · 2019-12-28 07:03:02

77

Views

Simple properties of cardinal numbers

Published on 28 Dec 2019 - 7:03

score 135 · Answer 14 · 2019-12-29 14:16:01

135

Views

Is it true without the axiom of choice that every infinite cardinal is larger than every finite cardinal?

Published on 29 Dec 2019 - 14:16

score 54 · Answer 15 · 2026-03-27 13:46:03

54

Views

Does every complex (or real) vector space posses a vector topology in which it is separable?

Published on 27 Mar 2026 - 13:46

List Question

proof there are exactly $\mathfrak c$ open sets in $\mathbb R$

Prove that an interval of rationals has the same cardinality as the rationals

The Ulam matrix and the definition of measurable cardinals.

Why are the cardinalities of direct and inverse limits of $\mathbb{Z}/p^k\mathbb{Z}$ different?

Augmented cardinal logarithm of the continuum

About sub-factors of real numbers

Proof: The cardinalities of two sets cannot be smaller than each other.

Cardinality of a subset of an ordinal

Trouble proving that $\mathbb{R} \approx \textbf{I} $

Covering of uncountable cardinal

Cardinal inequality

Is this use of bijections for comparing infinite cardinalities correct?

Simple properties of cardinal numbers

Is it true without the axiom of choice that every infinite cardinal is larger than every finite cardinal?

Does every complex (or real) vector space posses a vector topology in which it is separable?

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