Tomer Vromen

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953 reputation

717

bio	website
	location	Israel
	age	26
visits	member for	2 years, 10 months
	seen	Jan 24 at 17:43
stats	profile views	111

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12 Answers

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32	A challenge by R. P. Feynman: give counter-intuitive theorems that can be translated into everyday language
16	Find taxicab numbers in $O(n)$ time
10	Are $x \cdot 0 = 0$, $x \cdot 1 = x$, and $-(-x) = x$ axioms?
10	Cardinality of all cardinalities
8	What is a symmetric group?

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953 Reputation

+10	Are there any interesting semigroups that aren't monoids?
+10	Prove that $(n-1)! \equiv -1 \pmod{n}$ iff $n$ is prime
+10	Modular exponentiation using Euler’s theorem
+5	What are all the homomorphisms between the rings $\mathbb{Z}_{18}$ and $\mathbb{Z}_{15}$?

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5 Questions

votes activity newest

17	Tiling pentominoes into a 5x5x5 cube
6	Prove that $(n-1)! \equiv -1 \pmod{n}$ iff $n$ is prime
5	What are all the homomorphisms between the rings $\mathbb{Z}_{18}$ and $\mathbb{Z}_{15}$?
4	Restriction of trivariate polynomial to $1$ variable
0	Calculating matrix exponential by solving appropriate ODE

24 Tags

20 number-theory × 3	10 definition
19 algorithms × 2	8 group-theory × 2
11 abstract-algebra × 4	6 probability
10 set-theory × 2	4 modular-arithmetic
10 axioms	3 puzzle × 2

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$Mathematics Stack Exchange$	Mathematics	953 rep	717
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	Area 51	426 rep	7
	Super User	101 rep	1

19 Badges

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Notable Question	Taxonomist
Yearling × 2	Enlightened
Popular Question × 2	Quorum
Nice Answer × 4	Nice Question
Good Answer	Commentator

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