On Thu, 9 Jan 2020 06:06:59 -0500, Mario Carneiro <[email protected]> wrote:
> If you want the function version, look at dvmul. But the relation version
> is the core version, because it isn't good enough to know that the
> derivative equals x if you don't know the function is also differentiable
> at x. Plus the derivative is not unique in certain pathological cases so
> you can't actually recover the relation version from the function version
> with differentiability side conditions.

I've created a pull request to put this information into set.mm:
https://github.com/metamath/set.mm/pull/1397

--- David A. Wheeler

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