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The Array Cast
How to Write Alternating Sums in APL
The Taylor series for cosine alternates plus and minus that there are a lot of formulas in that that alternate. And then in APL gives you, I think they're called alternating sums but like I have no idea if that there's anything to like is there like obviously a plus reduction shows up everywherelike in yeah life and in math but I don't know of an actual thing where like a minus reduction is a thing,.
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