hardmath

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7,074 reputation

11133

bio	website	uclue.com
	location	Knoxville, TN
	age	60
visits	member for	2 years, 6 months
	seen	4 hours ago
stats	profile views	869

Enjoys programming in Prolog. Will solve math problems for food.

Rosser's trick: "For every proof of me, there is a shorter proof of my negation".

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224 Answers

votes activity newest

29	Can two topological spaces surject onto each other but not be homeomorphic?
12	Color an $n\times n$ square with $n$ colors
12	When do addition and inversion of matrices commute?
12	Homeomorphism of the unit disk onto itself which does not extend to the boundary
9	Form of rational solutions to $a^2+b^2=1$?

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7,074 Reputation

+10	Why multiplicative group $\mathbb{Z}_n^*$ is not cyclic for $n = 2^k$ and $k \ge 3$
+45	Applications of Double/Triple Integrals
+35	A basic question on the definition of $E[X]$
+5	Who was V. Viskovatov?

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7 Questions

votes activity newest

8	Centralizer of a specific permutation
7	Who was V. Viskovatov?
5	Counting some special derangements
3	Continued fraction expansion related to exponential generating function
2	Combining symmetries into a group action

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137 Tags

74 linear-algebra × 34	34 examples-counterexamples × 2
65 combinatorics × 27	30 number-theory × 9
49 matrices × 25	30 logic × 8
38 general-topology × 8	29 abstract-algebra × 12
37 geometry × 22	26 graph-theory × 12

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28 Accounts

$Mathematics Stack Exchange$	Mathematics	7,074 rep	11133
	Stack Overflow	3,917 rep	1826
	Computational Science	1,114 rep	1216
	Programmers	293 rep	1311
	Meta Stack Overflow	265 rep	126

29 Badges

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Constituent × 4	Yearling × 2
Caucus × 3	Quorum
Custodian × 7	Good Answer
Convention	Mortarboard
Excavator	Nice Answer × 5

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840 Votes Cast

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