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I'm so confused by this simple PDE. Any ELI5 explanations? (lemmy.dbzer0.com)

submitted 3 months ago* (last edited 3 months ago) by [email protected] to c/[email protected]

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Then I am stuck. I think the provided answer contains an error. But even if they are right, why does this last step equal f(x,y) + g(y) ????

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[–] [email protected] 2 points 21 hours ago

Absolutely agree, lowk a programmer must've done it else I don't think I've met a mathmematician (or maybe, not crazy enough ones) that ever preferred redefining variables (esp in pedagogical material!!!!)

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