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 Oct 8 awarded Curious Apr 7 revised How to use Maximize correctly added 10 characters in body Apr 7 revised How to use Maximize correctly added 1 characters in body Apr 7 asked How to use Maximize correctly Feb 2 accepted Binomial sum identities Jan 31 comment Binomial sum identities Thank you. Out of interest, can it persuaded to give Binomial[a+b,a] as the output? Jan 31 asked Binomial sum identities Apr 20 accepted Using RSolve correctly Apr 20 comment Using RSolve correctly Of course. Maybe it would be nice to have a central wiki for these feature requests/bugs. Apr 20 revised Using RSolve correctly added 23 characters in body Apr 20 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? Apr 20 awarded Editor Apr 20 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. Apr 20 revised Using RSolve correctly added 203 characters in body Apr 20 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? Apr 20 asked Using RSolve correctly Apr 17 accepted Minimize user defined function Apr 16 comment Minimize user defined function Thank you. The problem with Minimize is that it doesn't do anything in my case. Apr 16 asked Minimize user defined function Apr 16 awarded Scholar