AMPerrine
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 35 Which one result in mathematics has surprised you the most? 31 Getting $22$ as the answer always 21 Is $10^{8}!$ greater than $10^{10^9}$? 8 If $x * (y * z) = (x * z) * y$ for all $x, y, z \in S$, then $*$ is both associative and commutative 7 New to probability - Is this true?

### Reputation (2,276)

 +25 Why is the permutation $(a,c,d,e)(a,b)=(a,d)(b,c,e)$ +20 Prove $1+x$ is a unit in $R: \text{commutative ring}$ where $x$ is nilpotent +20 $D:=\{(x,y):x^2+y^2<1\}$ is complete? +15 How do I decide that a sequence is convergent in a metric space? Following example below.

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### Tags (52)

 32 puzzle × 2 14 algebra-precalculus × 5 31 number-theory 12 linear-algebra × 7 24 calculus × 10 12 abstract-algebra × 2 22 inequality × 2 11 group-theory × 5 21 factorial 9 functions × 3

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