3 ms·

This is about differentiability. >which it is then trying to force to have that property via a hack of sorts (f/|del f| apparently) The functions he talks abo

This is about differentiability. >which it is then trying to force to have that property via a hack of sorts (f/|del f| apparently) The functions he talks about do not have a derivative. So that hack is nonsensical.

ajkjk 1y ago
Evidently they do? Maybe there is some domain knowledge you're missing here as you belligerent protest that it's nonsense.
kragen 1y ago
Max, min, and the L1 norm? Those have derivatives (gradients) almost everywhere. The derivatives are undefined at a set of points of measure zero, and the functions are continuous across those gaps.
- constantcrying 1y ago
  And that means, by definition, that they do not have a derivative. If you don't believe me open a real analysis textbook.
  - ajkjk 1y ago
    You seem to be under the mistaken and misguided impression that the only kind of derivative is the one in a real analysis textbook. I bet you think delta functions aren't real either, lol.
    - kragen 1y ago
      Are Dirac deltas hyperreal? Asking for a friend.