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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^nbinomial(N, n), n, 1/2*N + 1/2, N)`
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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.
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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?`