Comment by sfpotter
5 days ago
For a function to be locally linear at a point, it needs to be differentiable at that point... |x| isn't differentiable at 0, so it isn't locally linear at 0... that's the entirety of what I'm saying. :-)
5 days ago
For a function to be locally linear at a point, it needs to be differentiable at that point... |x| isn't differentiable at 0, so it isn't locally linear at 0... that's the entirety of what I'm saying. :-)
You're not wrong. But it has nothing to do with what I said. I think you missed an important word...
Btw, my point was all about how nuances make things hard. So ironically, thanks for making my point clearer.
Nothing to do with what you said?
Hmm...
Sometimes naive approximations are all you've got; and in fact, aren't naive at all. They're just basic. Don't overthink it.