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### Questions (13)

 3 Combinatorics problem on counting. 3 Can a bounded number sequence be strictly ascending? [closed] 3 A functional equation defined on the real axis. 2 How do I prove an antisymetrical polynomial $~f(x,y)~$ is divisible by $~x-y~$ 2 Can 2017 be written uniquely as a sum of 2 squares? [duplicate]

### Reputation (160)

 +10 How do I prove an antisymetrical polynomial $~f(x,y)~$ is divisible by $~x-y~$ +5 Is the following property of convex functions true? +8 How can I prove this multilinear inequality? -2 How can I prove these two inequalities?

### Answer (1)

 7 Can the empty set be the image of a function on $\mathbb{N}$?

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 7 functions × 3 0 systems-of-equations 7 elementary-set-theory 0 symmetric-polynomials 0 inequality × 3 0 combinatorics 0 functional-equations × 2 0 elementary-number-theory 0 sequences-and-series 0 sums-of-squares

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