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John Hughes's user avatar
John Hughes's user avatar
John Hughes
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I'm a professor of Computer Science at Brown University. My degree is in mathematics, and I used to study topology (and still do in my spare time).

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77
How did mathematicians decide on the axioms of linear algebra
Nov 21, 2015
answer
56
Can rotations in 4D be given an explicit matrix form?
Aug 19, 2015
answer
48
Trouble understanding only one way implication truth
Feb 5, 2018
answer
48
Connected sum of projective plane $\cong$ Klein bottle
Nov 27, 2014
answer
48
Rotation Matrix of rotation around a point other than the origin
Jan 11, 2017
answer
43
Can you completely permute the elements of a matrix by applying permutation matrices?
May 10, 2018
answer
41
Homomorphisms between fields are injective.
Oct 4, 2014
answer
39
How do you calculate a sum over a polynomial?
Sep 11, 2015
answer
36
Could *I* have come up with the definition of Compactness (and Connectedness)?
Aug 6, 2019
answer
36
Entering math through the side door
Aug 14, 2015
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Can I post a 'homework' question without any MathJax/Latex.
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Representing $\Bbb RP^2$ in Lean: building a type representing a particular set
11
How to generate random integers between 1 and 4 that have a specific mean?
9
How did the meaning of "lifting" in proof assistants arise?
7
I want to control a sewing machine motor; need help with choices
7
How to test if a Linux directory contain only one subdirectory and no other files?