2020-09-10 00:31:06 +0200 received badge ● Famous Question (source) 2014-06-24 19:22:28 +0200 received badge ● Notable Question (source) 2013-09-01 13:11:13 +0200 received badge ● Popular Question (source) 2011-09-23 08:25:05 +0200 received badge ● Supporter (source) 2011-09-23 08:24:55 +0200 marked best answer TypeError: Computation failed since Maxima requested additional constraints This is a typical error message from Sage via Maxima. But maybe I need an update from you. I get sage: N, n, f = var('N, n, f') sage: assume(N>0) sage: sum(binomial(N, n)*f^n*(1-f)^(N-n), n, (N+1)/2, N) sum((-f + 1)^(N - n)*f^n*binomial(N, n), n, 1/2*N + 1/2, N)  2011-09-23 08:24:55 +0200 received badge ● Scholar (source) 2011-09-23 08:24:51 +0200 commented answer TypeError: Computation failed since Maxima requested additional constraints For some reason, it works now for me as well. (Maybe I had some inconsistent variable definitions I did not flush out or something). Thanks for checking. 2011-09-22 14:57:01 +0200 received badge ● Editor (source) 2011-09-22 14:56:11 +0200 asked a question TypeError: Computation failed since Maxima requested additional constraints I have the following code:  N, n, f = var('N, n, f') assume(N>0) sum(binomial(N, n)*f^n*(1-f)^(N-n), n, (N+1)/2, N)  It gives me the following error message:  TypeError: Computation failed since Maxima requested additional constraints (try the command 'assume(N+1>0)' before integral or limit evaluation, for example): Is N+1 positive, negative, or zero?