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diff does not work with Eq #19727

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friyaz opened this issue Jul 8, 2020 · 1 comment

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core

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friyaz commented Jul 8, 2020

On sympy master:

>>> from sympy import *
>>> from sympy.abc import x, y
>>> eq = Eq(x**2 + y**2 - 4, 0)
>>> diff(eq, x)
Derivative(Eq(x**2 + y**2 - 4, 0), x)
>>> diff(eq, x).doit()
Derivative(Eq(x**2 + y**2 - 4, 0), x)

Is this the expected behavior? I think it will be better if diff should differentiate both LHS and RHS and returns an Eq.

Contributor

oscarbenjamin commented Jul 8, 2020

See #4986 and #19479

sylee957 added the core label

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