V. Galerkin
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 Apr 7 awarded Yearling Jun 6 awarded Popular Question Dec 23 awarded Yearling Sep 18 suggested rejected edit on Function $f(x)=x^2+1$. Find a function g with $(f∘g)(x)=x+5$ ?? Sep 15 revised Prove that $\max\{|x_i|: 1 \leq i \leq n\} \leq \|\vec{x}\| \leq \sum_{i=1}^{n} |x_i|$ improved formatting of title Sep 15 suggested approved edit on Prove that $\max\{|x_i|: 1 \leq i \leq n\} \leq \|\vec{x}\| \leq \sum_{i=1}^{n} |x_i|$ Sep 3 accepted If $f'(t) = g'(t)$ then $f(t) = g(t) + k$ for all $t\in\mathbb R$ Sep 1 revised Second derivative expression added edit II Sep 1 asked Second derivative expression Aug 20 awarded Nice Question Aug 14 awarded Notable Question Aug 6 accepted Joint PDF of random variables Jul 2 awarded Curious Apr 27 awarded Popular Question Jan 18 comment Joint PDF of random variables Thanks. I just wanted to express everything formally and didn't found the way by doing this. Also, how do you differentiate with respecto to $z$ without working out the integrals? Jan 18 comment Joint PDF of random variables Thanks for your answer. However, I am wondering what steps you have followed in order to get those results. For example, "Just write $F_Z(z)=\mathrm P\{X+Y\leq z\}=\int_{-\infty}^\infty \int_{-\infty}^{z-y}...$" is not clear to me. Also, for the CDF in 2nd part, I have $F_{Z,W}(z,w) = P(X+Y\leq z, \min\{X,Y\}\leq w)$, but what else?. The support is $(0,2)\times(0,1)$. Jan 18 revised Joint PDF of random variables added attempt Jan 17 asked Joint PDF of random variables Dec 23 awarded Yearling Dec 10 accepted Distribution function of random variable