Santi Spadaro

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Name	Santi Spadaro
Member for	2 years
Seen	12 hours ago
Website	twitter.com/SantiSpadaro1
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Age	32

I like espresso and espresso-sized proofs.

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Does the generalized $\Delta$-system lemma imply some weak version of the GCH?

set-theory

may 17 at 18:48 Joel David Hamkins 76.8k●8●192●355

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102

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On the cardinality of perfect spaces with the countable chain condition

may 13 at 21:48 Santi Spadaro 686●4●6

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387

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Periodic point-free maps and free ultrafilters.

set-theory gn.general-topology

mar 11 at 13:01 Andreas Blass 33.8k●4●59●111

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114

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Well-founded families of sets and topological convergence

gn.general-topology set-theory convergence

mar 25 at 16:19 Santi Spadaro 686●4●6

Answers

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Which powers of the closed unit interval are homogeneous?

What is the smallest cardinality a topology can have which is c.c.c but not separable (in ZFC)?

Is there a compact space with no countably generated dense subspace?

A question on metrizable space

What are some reasonable-sounding statements that are independent of ZFC?

$\aleph_\omega$ many subsets of $\aleph_\omega$

A conjecture on closed discrete subset

the example of ccc but not separable

Not especially famous, long-open problems which anyone can understand

Magic trick based on deep mathematics

Extremely messy proofs

The integers as a sequential but non-first countable topological group

Closure-complement-union: countable space, finite seed, infinite family, space unique?

Basic results with three or more hypotheses

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Santi Spadaro

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Questions

Does the generalized $\Delta$-system lemma imply some weak version of the GCH?

On the cardinality of perfect spaces with the countable chain condition

Periodic point-free maps and free ultrafilters.

Well-founded families of sets and topological convergence

Answers

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