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Zhanxiong
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18 $f(x) =ax^6 +bx^5+cx^4+dx^3+ex^2+gx+h $, find $f(7)$. Jul 26 '15
16 Limit of $n!/n^n$ as $n$ tends to infinity Aug 8 '15
12 Help with Spivak's Calculus: Chapter 1 Problem 22 Aug 14 '15
11 algebra problem, Solve the equation Aug 12 '15
11 Prove $\limsup\limits_{n \to \infty} (a_n+b_n) \le \limsup\limits_{n \to \infty} a_n + \limsup\limits_{n \to \infty} b_n$ Aug 12 '15
11 Postive-semidefiniteness of matrix with entries $1/(a_i+a_j)$ Jan 26 '16
10 Are the random variables $X + Y$ and $X - Y$ independent if $X, Y$ are distributed normal? Jan 25 '16
9 Proof of a change-of-measure formula Dec 14 '16
8 Prove a symmetric complex matrix is non-singular Dec 21 '20
8 How to prove that $(\frac{n}{k})^k\leq{{n}\choose{k}}\leq\frac{n^k}{k!}$? Jul 21 '15
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