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2012-11-26 16:48:26 +0200 | answered a question | Double sum Thank you. You are right : max(a,b) gives me a. I used max_symbolic instead, I get no error, but SAGE can't simplify the double sum. |
2012-11-26 15:41:27 +0200 | asked a question | Double sum Hello, I would like SAGE to compute a double sum like $\sum\limits_{1\le a\le n}\sum\limits_{1\le b\le n} \max(a,b)$. The result is strange : SAGE tells me that f(2) is 6. But it is rather 7 (unless i am very tired). Thank you for your advices :-) Pierre |