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2d
accepted A proof that powers of two cannot be expressed as the sum of multiple consecutive positive integers that uses binary representations?
2d
accepted Why does every undirected graph have at least one cut of size $|E| / 2$?
2d
accepted If $\ln x$ is defined via an integral and $e$ defined from $\ln x$, how would you prove that $\ln x$ is the inverse of $e^x$?
2d
accepted Solving the recurrence $T(n) = \sqrt n T(\sqrt{n}) + \sqrt{n}$
Jun
29
comment What is the opposite of a derangement?
@ConradoCosta Oh, I wasn't planning on just having students memorize the names for things. I was hoping to have students spend a decent amount of time proving things about these functions and wanted to make sure that if there was an appropriate name for these functions that I would use it correctly.
Jun
29
comment What is the opposite of a derangement?
@ConradoCosta I'm teaching a discrete math course and a question came up where it was useful to talk about functions with this property. I ended up calling them "non-derangements," but it sounded really silly.
Jun
29
asked What is the opposite of a derangement?
Jun
28
awarded  Nice Question
Jun
19
revised What to do next with this indefinite integral?
added 122 characters in body; edited title
Jun
18
asked Solving the recurrence $T(n) = \sqrt n T(\sqrt{n}) + \sqrt{n}$
Jun
4
revised Name of the highest power of 2 smaller than or equal to a given number
added 4 characters in body
Jun
4
awarded  Nice Answer
Jun
3
revised What is the most unusual proof you know that $\sqrt{2}$ is irrational?
added 39 characters in body
Jun
3
answered Name of the highest power of 2 smaller than or equal to a given number
May
30
awarded  Nice Question
May
29
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May
8
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Mar
31
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Mar
8
awarded  Popular Question
Feb
23
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