Tomer Vromen
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 51 A challenge by R. P. Feynman: give counter-intuitive theorems that can be translated into everyday language 20 Find taxicab numbers in $O(n)$ time 18 Cardinality of all cardinalities 10 Are $x \cdot 0 = 0$, $x \cdot 1 = x$, and $-(-x) = x$ axioms? 9 What is a symmetric group?

### Reputation (1,184)

 +10 What is a symmetric group? +10 Non-Linear Transformation +5 Tiling pentominoes into a 5x5x5 cube +10 Cardinality of all cardinalities

### Questions (5)

 18 Tiling pentominoes into a 5x5x5 cube 9 Prove that $(n-1)! \equiv -1 \pmod{n}$ iff $n$ is prime 8 What are all the homomorphisms between the rings $\mathbb{Z}_{18}$ and $\mathbb{Z}_{15}$? 5 Restriction of trivariate polynomial to $1$ variable 1 Calculating matrix exponential by solving appropriate ODE

### Tags (27)

 24 algorithms × 2 10 axioms 24 number-theory × 2 10 definition 18 cardinals 9 group-theory × 2 17 set-theory × 2 7 calculus × 2 11 abstract-algebra × 4 6 transformation

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