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bc.. I propose we add Dirac delta function.
This is needed for diff(sign(x), x) and for diff(Piecewise(...))
What do you think?
p. Original issue for "#3771":https://github.com/sympy/sympy/issues/37…
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RubyGems.org doesn't report a license for your gem. This is because it is not specified in the [gemspec](http:t/docs.rubygems.org/read/chapter/20#license) of your last release.
via e.g.
```
spec.li…
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This wasn't hard to implement, since all the hard work was already done.
Component: **algebra**
Author: **Robert Miller**
Reviewer: **Robert Bradshaw, John Cremona**
Merged: **sage-4.3.1.alpha2*…