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 Nov 15 comment Is there a simple solution for $\frac{d}{dy} \log\big( \int_{0}^{y} \exp(-a \frac{x^{3/2}}{y}+ b x)\, dx \big)$ can't you just use the fact that $\frac{d}{dx}\log(f(x))=\frac{f'(x)}{f(x)}$? Nov 15 comment Which course will provide me with a rigorous re-introduction to calculus? yes real analysis, no prereqs. Do it the right way and use Baby Rudin. Nov 15 awarded Popular Question Nov 15 comment Calculating probability from a summation of the Negative Binomial Distribution it seems like you are understanding it, your sum may have a closed form it may not but what it's important is knowing what it represents since you can always just calculate it numerically. Nov 15 comment How to solve for the n-step state probability vector for the Markov chain isn't it just $(P^T)^ne_1$? Nov 15 comment Finding probability distribution of $X$ you need to integrate with $x$ in the limits, so reverse that inequality expression so it's an inequality about $y$ in terms on $x$. Nov 14 comment Expected time for both people to finish a job the distribution for the max is the probability that both random variables are less than $t$, so you need to take the product of the single integrals instead of computing the double integral. i.e. \$P(\max(X,Y)