Mathematics
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David C. Ullrich
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Nothing about me is of any interest whatever.

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  • Member for 5 years, 11 months
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79 Are there theoretical applications of trigonometry? May 2 '16
61 Did Joseph Fourier ever make a pure mathematical mistake? Jun 24 '16
54 What is the average rational number? May 28 '16
42 Is every noninvertible matrix a zero divisor? Jul 15 '15
38 Does every infinite field contain a countably infinite subfield? Nov 7 '15
33 Problem of a slow thinker Jul 14 '18
23 Second derivative of $\det(\mathbb{1}+tA)$? Jun 25 '18
23 If every five point subset of a metric space can be isometrically embedded in the plane then is it possible for the metric space also? Jun 17 '16
21 Can we recover a space from its continuous functions? Oct 1 '15
20 $\lim_{n\to\infty} f(t/n)=0$ for every $t$ implies $\lim_{t\to0^+}f(t)=0$ (???) Jan 6 '18
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