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 Apr7 revised How to use Maximize correctly added 10 characters in body Apr7 revised How to use Maximize correctly added 1 characters in body Apr7 asked How to use Maximize correctly Feb2 accepted Binomial sum identities Jan31 comment Binomial sum identities Thank you. Out of interest, can it persuaded to give Binomial[a+b,a] as the output? Jan31 asked Binomial sum identities Apr20 accepted Using RSolve correctly Apr20 comment Using RSolve correctly Of course. Maybe it would be nice to have a central wiki for these feature requests/bugs. Apr20 revised Using RSolve correctly added 23 characters in body Apr20 comment Using RSolve correctly Thank you. You are quite right about the addendum (and I was wrong). I needed to have a way to specify that $i=k$. In terms of the initial condition $i==0$ although I see your point I don't think I agree. A perfectly good answer would be if $n \geq 1$ then $q[n]= e$ Gamma$[n,1]$, if $n =0$ then $q[n]=0$ wouldn't it? Apr20 awarded Editor Apr20 comment Using RSolve correctly Thanks. I am only interested in integer $i \geq 1$. I see that defining $q[0]$ implies to Mathematica that that it should provide a general solution that holds for $i=0$ as well which it can't do. Apr20 revised Using RSolve correctly added 203 characters in body Apr20 comment Using RSolve correctly That seems very unhelpful of Mathematica to me. q[1]==1 gives a useful answer. How would you know which initial conditions it will be happy with? Apr20 asked Using RSolve correctly Apr17 accepted Minimize user defined function Apr16 comment Minimize user defined function Thank you. The problem with Minimize is that it doesn't do anything in my case. Apr16 asked Minimize user defined function Apr16 awarded Scholar Apr16 accepted Why does Integrate return a solution that is not defined at a particular point when it actually is well defined at that point?