chisquared·hace 2 años·discuss> We don't recommend oh-my-fish for various reasonsCare to elaborate a bit on those? Or is it the kind of thing that's impolite to discuss?
chisquared·hace 2 años·discussThere’s no need for this extension: https://news.ycombinator.com/item?id=42425681
chisquared·hace 2 años·discussIf b is negative, define c = -b, and use the linked result to show thata^2 - b^2 = a^2 - (-c)^2 = a^2 - c^2 = (a + c)(a - c) = (a + b)(a - b)
chisquared·hace 2 años·discuss> Then you've just skipped the case when a^2 - b^2 is negative.Not really. If b > a, then swap them to conclude that b^2 - a^2 = (b + a)(b - a), which is what the visual proof demonstrates.Your conclusion is equivalent to saying that a^2 - b^2 = (a + b)(a - b).
Care to elaborate a bit on those? Or is it the kind of thing that's impolite to discuss?