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15
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Arithmetic on infinite cardinal numbers

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#set-theory #cardinals #ordinals
88
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Generalized Ramsey numbers, possibly infinite?

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#graph-theory #reference-request #cardinals #ramsey-theory #extremal-graph-theory
230
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What is the cardinality of the set of subgroups of $(\mathbb R, +)$?

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#group-theory #proof-verification #cardinals
80
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An exercise from Herrlich

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#set-theory #cardinals
275
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Undecidable cardinality

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#set-theory #examples-counterexamples #cardinals #decidability
47
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$KG(\mathfrak a_1,\mathfrak b_1)\cong KG(\mathfrak a_2,\mathfrak b_2)$ with $(\mathfrak a_1,\mathfrak b_1)\neq(\mathfrak a_2,\mathfrak b_2)$

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#graph-theory #set-theory #cardinals
83
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Does $ | X | = | \mathbb{R} |$ hold for all Banach spaces $X$?

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#set-theory #banach-spaces #cardinals
49
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Lemma I.13.19 on Kunen's set theory

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#set-theory #cardinals
313
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Weakly inaccessible cardinal such that $\kappa^{<\kappa}=\kappa$

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#set-theory #cardinals #large-cardinals
68
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Can the cardinality of a set $\mathbb{S}^n$ be written in terms of $\lvert S\rvert$?

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#elementary-set-theory #cardinals
152
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Unsure of what to think about negation of Continuum Hypothesis, a need of clarification

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#set-theory #cardinals
138
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Proving $\operatorname{Card} (\omega_1)\leq \operatorname{Card} (P(\mathbb{N}))$

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#set-theory #cardinals #ordinals
146
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Measurability of $\frak c$

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#elementary-set-theory #cardinals #large-cardinals #continuum-theory
75
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I would like to know if my reasoning is right, or I have errors.

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#proof-verification #elementary-set-theory #cardinals
98
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Is this bijection from $\mathbb{R}-\mathbb{Z}$ to $\mathbb{R}$ correct?

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#elementary-set-theory #cardinals

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