Maxima：如何输入复杂级数的术语

Question

如何在 Maxima 中输入以下系列的通用术语？

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Answer 1

好吧，首先可以在总和之外取二项式，并且可以以封闭形式执行总和：

无论如何，您给出的整个表达式将输入 maxima 作为

u(a, m, n) := (-h)^(n-a) * sum((-1)^j * binomial(a-n,n) * (1+h)^j, j, 0, m-n);