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user2520938
  • Member for 8 years, 5 months
  • Last seen more than 1 year ago
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34
How can we prove that a binomial coefficient $n\choose m$is divisible by the ratio of $n$ and $\gcd(n,m)$?
33
No matter how many algebraic invariants we attach to topological spaces, there will always be nonhomeomorphic spaces agreeing on all their invariants
21
May a 'ball' that has been 'cut off' still be called a 'ball'?
19
Is every prime the average of two other primes?
17
What's so useful about diagonalizing a matrix?

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