When I enter these expressions into wolfram I get that they're not equal. Why is this? Essentially I'm trying to say $$ 1+2+\cdots+n = n+(n-1)+\cdots+1 $$
2026-04-01 14:02:47.1775052167
Is $\sum_{i=1}^n i = \sum_{i=n}^1 i$
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