V. Galerkin
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 Dec23 awarded Yearling Sep18 suggested rejected edit on Function $f(x)=x^2+1$. Find a function g with $(f∘g)(x)=x+5$ ?? Sep15 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 Sep15 suggested approved edit on Prove that $\max\{|x_i|: 1 \leq i \leq n\} \leq \|\vec{x}\| \leq \sum_{i=1}^{n} |x_i|$ Sep3 accepted If $f'(t) = g'(t)$ then $f(t) = g(t) + k$ for all $t\in\mathbb R$ Sep1 revised Second derivative expression added edit II Sep1 asked Second derivative expression Aug20 awarded Nice Question Aug14 awarded Notable Question Aug6 accepted Joint PDF of random variables Jul2 awarded Curious Apr27 awarded Popular Question Jan18 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? Jan18 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 $(0,2)\times(0,1)$. Jan18 revised Joint PDF of random variables added attempt Jan17 asked Joint PDF of random variables Dec23 awarded Yearling Dec10 accepted Distribution function of random variable Dec10 awarded Citizen Patrol Dec10 revised Distribution function of random variable added edit & corrected spelling