Mathematics
David C. Ullrich's user avatar
David C. Ullrich's user avatar
David C. Ullrich's user avatar
David C. Ullrich
  • Member for 8 years, 3 months
  • Last seen more than a month ago
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Nothing about me is of any interest whatever.

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All Questions Answers
Score Newest
answer
81
Are there theoretical applications of trigonometry?
May 2, 2016
answer
63
Did Joseph Fourier ever make a pure mathematical mistake?
Jun 24, 2016
answer
56
What is the average rational number?
May 28, 2016
answer
47
Is every noninvertible matrix a zero divisor?
Jul 15, 2015
answer
40
Problem of a slow thinker
Jul 14, 2018
answer
40
Does every infinite field contain a countably infinite subfield?
Nov 7, 2015
answer
30
Second derivative of $\det(\mathbb{1}+tA)$?
Jun 25, 2018
answer
27
Reference for "distributional derivative being zero implies being constant"
Aug 15, 2015
answer
25
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, 2016
answer
24
Extension of real analytic function to a complex analytic function
Apr 27, 2016
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"... including any attempts you have made to solve it."
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Reference Request not a request for a reference?
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Etiquette dilemma
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Are questions about history on topic?
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Finding all roots of a polynomial
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Conditional \bye?

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