chisquared

2 năm trướcdiscuss

> We don't recommend oh-my-fish for various reasons

Care to elaborate a bit on those? Or is it the kind of thing that's impolite to discuss?

chisquared

2 năm trướcdiscuss

There’s no need for this extension: https://news.ycombinator.com/item?id=42425681

chisquared

2 năm trướcdiscuss

If b is negative, define c = -b, and use the linked result to show that

a^2 - b^2 = a^2 - (-c)^2 = a^2 - c^2 = (a + c)(a - c) = (a + b)(a - b)

chisquared

2 năm trướcdiscuss

> 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).

chisquared

2 năm trướcdiscuss

Steve Jobs would have agreed with you at one point.

I'm not sure what changed his mind (or if he ever even really did), but he also thought that aside from the native apps that came with the iPhone, everything else should just be a web app.

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