Mathematics
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Randall's user avatar
Randall's user avatar
Randall
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Professor and former chair of a math department.

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All Questions Answers
Score Newest
answer
75
"Naturally occurring" non-Hausdorff spaces?
Aug 3, 2020
question
33
Power series representation of arctangent: fails to converge everywhere
Nov 27, 2017
answer
30
What's a "deleted neighborhood"? (other than very very confusing)
Sep 12, 2017
answer
29
Do cubics always have one real root?
Mar 10, 2019
answer
27
Why must be the additive and multiplicative identities in a field be different?
Nov 16, 2017
answer
19
Is $\Bbb R/\Bbb Z$ isomorphic to $\Bbb R/2\Bbb Z$?
Mar 12, 2018
answer
17
What's the difference between biconditional iff and logical equivalence?
Sep 17, 2017
answer
14
Is there a metric on the reals $\Bbb R$ so that a subset of $\Bbb R$ is open iff its complement is finite?
Jul 29, 2018
answer
14
For vector spaces $V,W$ over $\mathbf{k}$, is every additive $\phi: V \to W$ also $\mathbf{k}$-linear?
Aug 23, 2020
answer
13
What does it mean when I say that addition/multiplication for an equivalence relation is well defined?
Apr 29, 2018
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33
Excess income after fully funding all retirement accounts. Now what?

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