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# Questions

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### How To Present Mathematics To Non-Mathematicians?

apr 6 12 at 21:02 Ronnie Brown 5,2871920

7
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2k
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### Does $2^X=2^Y\Rightarrow |X|=|Y|$ imply the axiom of choice?

aug 25 at 0:13 Asaf Karagila 7,24311444

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### Half Cantor-Bernstein Without Choice

may 19 11 at 9:07 Ricky Demer 6,411831

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1k
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### Countable Unions And The Axiom Of Countable Choice

sep 18 11 at 4:36 godelian 923712

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### If $V$ is a vector space with a basis. $W\subseteq V$ has to have a basis too?

nov 14 11 at 1:05 Goldstern 5,26011227

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### Does ZFC prove the universe is linearly orderable?

nov 3 at 3:47 Joel David Hamkins 75.5k8189347

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### What is a Choice Principle, really?

aug 6 at 8:59 Andrej Bauer 12.5k2769

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10
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778
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### Universal sets in metric spaces

sep 23 at 12:45 Theo Buehler 3,66611125

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774
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### The Continuum Hypothesis and Countable Unions

oct 18 at 14:10 Asaf Karagila 7,24311444

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