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weakly normal filters

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#set-theory #cardinals #filters
97
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Possible use of choice in proving "Compactness implies limit point compactness"

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#general-topology #set-theory #compactness #axiom-of-choice
385
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Why can't we just add "nothing else is a set" as an axiom?

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#set-theory
128
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Avoiding choice in proving "Sequential compactness implies Lebesgue Number Lemma"

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#general-topology #set-theory #axiom-of-choice
152
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What goes wrong shooting a club on $\kappa >\aleph_1$?

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#set-theory #forcing
102
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Is there a notion that quantify the dependence of a proof on AC?

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#logic #set-theory #axiom-of-choice #proof-theory
86
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What does: "for all free variables shown" mean in Set Theory.

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#logic #set-theory
84
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Cardinality of k-bijections

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#set-theory
192
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Countable set of sequences - is there a sequence where every element is greater or equal?

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#sequences-and-series #set-theory
179
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Which classes of subsets are absolute under forcing?

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#general-topology #set-theory #descriptive-set-theory #forcing
74
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finding bijection such that $|\{ x\in A : x \neq f(x)\}| =\mathfrak{c} $

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#set-theory #cardinals
245
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Linearly ordering the power set of a well ordered set with ZF (without AC)

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#logic #set-theory #order-theory #well-orders
189
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Why is the "axiom of extension" an axiom?

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#logic #set-theory #axioms
272
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Is there an embedding theorem for non-second-countable manifolds?

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#general-topology #set-theory #manifolds
83
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Why is there a unique ordinal $\alpha$ for every infinite cardinal $\kappa$ such that $\kappa = \aleph_\alpha$?

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#set-theory

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