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 Feb24 awarded Enthusiast Feb16 accepted Sum of Multinomial Coefficients Feb15 comment Sum of Multinomial Coefficients No unfortunately not. Its my job to do de computation and provide numerical examples. The only "external" information is that i am given the number $m$ and that $L\subseteq \{1,...,n\}$.I think I'll need to think it through once more, maybe I'll understand what's meant then. Feb15 comment Sum of Multinomial Coefficients I does not make sense to me either, until now I haven't seen such an expression. These sum is an input into another function. I wrote down exactly how it is formulated in the paper. I'm sorry Feb15 revised Sum of Multinomial Coefficients added 45 characters in body Feb15 comment Sum of Multinomial Coefficients Thank you. But it's actually more complicated. I'm still not 100% sure if i got how one calculates the sum. I updated my question. I think it means that if $L=(1,2,4,5)$ that the third element can be zero. I'm sorry I haven't seen such a notation. Feb15 revised Sum of Multinomial Coefficients added 16 characters in body Feb15 comment Sum of Multinomial Coefficients thank you, I also do need a variation of that. Do you have an idea how to get only that coefficients where $k_i$ is not 0. In your example above it would be just the last term $\binom{5}{1\ 1\ 1\ 2}$? Feb14 awarded Commentator Feb14 comment Sum of Multinomial Coefficients I'm so sorry I didnt saw that you wrote an answer! I wouldnt have deleted the question. I figured out the same solution as you posted myself. Anyway I'll keep the question! I apologize once more! Feb14 asked Sum of Multinomial Coefficients Feb12 comment Speed up Numerical Integration thank you all very much, I figured out how i could optimize my integration, but i have one last point. I have to Integrations the first I need to use "normal" Integrate and in the second one NIntegrate. I can't use NIntegrate in the first because there are still variables in the output . Is it possible to speed that further up? I have no assumptions to make to the function. Feb12 comment Get unique values for integration limits Thanks, but I also need to remove the unnecessary sublists of x1,x2,x3. I just want the first sublist for x1, second one for x2,... Feb12 asked Get unique values for integration limits Feb10 comment Finding an index with certain conditions Thanks, I figured out how to do it with your first solution! Feb10 accepted Finding an index with certain conditions Feb10 comment Finding an index with certain conditions mho, no actually it should be i=5, because if i=6 i would get t_(n-i-1)=t_(-1)which would make no sense,ishould be lower than n. Feb10 revised Finding an index with certain conditions edited body Feb10 revised Finding an index with certain conditions deleted 3 characters in body Feb10 comment Finding an index with certain conditions It's difficult for me to explain it properly but i try my best: if n-(i+1)=0 we have t_0which does not exist so we set it to Infinity. Basically I did a coordination transformation and need to find the index (time) in the new system between which tis my c is.