80 Every polynomial with real coefficients is the sum of cubes of three polynomials 43 Value of $(\alpha^2+1)(\beta^2+1)(\gamma^2+1)(\delta^2+1)$ if $z^4-2z^3+z^2+z-7=0$ for $z=\alpha$, $\beta$, $\gamma$, $\delta$ 40 Intuitive reason for why $\left(\displaystyle\sum_{i=0}^n i\right)^2 = \displaystyle\sum_{i=0}^n i^3$ 31 Does an increasing sequence of reals converge if the difference of consecutive terms approaches zero? 29 Prime number construction game

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 +10 $f$ differentiable except in $1$ point +20 Compute the limit: $\lim_{n\to\infty}\int_0^\infty\frac{n^2[\cos(x/n^2)-1]}{1+x^3}dx.$ +10 How to prove that for $n$ even and positive, the first player can guarantee a win? +10 How do I find the radius and interval of convergence for the power series

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 136 The Hole in One Pizza 24 Mysterious identity 6 A property of continuous bijective maps in the plane. 5 How to show that this identity holds? 4 Palindromic numbers whose squares are palindromic too

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