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2019-04-11 15:24:25 +0200	commented answer	function parameters as sum limits Thank you for the clarification; and yes `d` is just a remainder from the original (more complicated) function I needed to compute. Should I remove it from the question?
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2019-04-09 18:48:14 +0200	asked a question	function parameters as sum limits I am completely new to sage, so I am afraid that this should be a very standard well known issue. Sorry for that. I need to define a function one of whose parameters is a limit of a sum. I tried: `d,n,i = var('d,n,i') def N(d,n): if n==1: return 1 else: return sum(N(d,i),i,1,n-1)` But sage complains with a RuntimeError. Why is that? I suppose that for some reason the parameter `n` from the function is not assigned to the variable limit `n-1` in the sum. I this correct? How can I fix that?