Longeyes
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# 198 Reputation

25 Feb 1
 +25 10:12 2 events How to work with a statement: “for all $x$, if $p(x)$ then $q(x)$” (contradiction and contraposition)
5 Dec 18 '14
 +5 15:22 upvote If $\int(f_n) \rightarrow \int(f)$ then $\int(|f_n-f|) \rightarrow 0$ for $f_n \rightarrow f$ pointwise
17 Nov 23 '14
 +5 15:19 upvote Number of solution pairs $(i,j)$ such that $i+jk \leq l$ +2 15:23 accept If $\sum_{n \geq 1}X_n$ converges a.s. then $\forall a > 0: \sum P(|X_n|>a) < \infty$ +2 15:22 accept Prove $||A||_2 = max_{x \neq 0, y \neq 0}\{\frac{|\langle y,Ax \rangle|}{||x||\cdot ||y||}\}$ for $A\in \mathbb{K}^{n\times m}$ +2 15:22 accept Prove a random variable has normal distribution +2 15:19 accept Example: Sum of non-commuting matrices is not normal +2 15:19 accept Find angle of incomplete rotation matrix +2 15:19 accept Determine $\frac{\partial}{\partial r} \int\!\!\!\!\!\!-_{B(x,r)} \frac{r}{n} u_{xx}(y)dy$
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