Top network posts

• 24 $A=\frac{\mathbb{C}[X,Y]}{(X^2+Y^2-1)}$ is a PID.
• 10 How prove this $x^3+y^3+z^3+3\ge 2(x^2+y^2+z^2)$
• 10 $ f(x)\leq f(x+\frac{1}{n} )$ for all $x\in \mathbb{R}$ and $n\geq 1$ . Prove that $f$ is non-decreasing .
• 9 If $\operatorname{Ker} f$ is a $G_\delta$ set in $X$, then $f$ is continuous
• 8 $\frac{a_{max}}{\sum a_i} \to 0$: Proof or Counterexample
• 8 Limit $\lim_{n\to\infty}\sum_{k=0}^n\binom nk\frac{3k}{2^n(n+3k)}$
• 7 $\{X_n\}$ are iid random variables with symmetric distribution
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