Joel Cohen
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 30 Is there an equation to describe regular polygons? 19 Continuity of the roots of a polynomial in terms of its coefficients 16 Determine the number of functions $f: \mathbb{Z}_{p^n} \to \mathbb{Z}_{p^n}$ 15 Does $f(z+2\pi)=f(z)$ for all $z\in \mathbb{C}$? 14 How to prove those “curious identities”?

### Reputation (5,858)

 +10 If $|f(x)+g(x)|=|f(x)|+|g(x)|$ and $|f(x)|=\lambda |g(x)|$ do we have $f(x)=\lambda g(x)$? +20 Is there an equation to describe regular polygons? +10 Continuity of the roots of a polynomial in terms of its coefficients +10 How does extending a field affect matrix similitude?

### Questions (4)

 12 nth powers modulo all primes 10 Primes of the form 1..1 4 Infimum of the support of a convolution product 3 Sum of coefficients of an orthogonal matrix

### Tags (103)

 73 abstract-algebra × 17 36 field-theory × 6 48 complex-numbers × 10 30 polynomials × 4 41 complex-analysis × 8 30 geometry 39 group-theory × 9 30 analytic-geometry 37 analysis × 5 29 algebra-precalculus × 3

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