I think another problem here is that Maxima is called at all. It happens
because the manifolds code naively compares two symbolic expressions via
'='. This invokes the full equality proof machinery, which is probably not
671 return bool(other._express == self._express)
--> 673 return bool(self._express == other)
675 def __neg__(self):
Rather, the line should read:
return (self._express - other).is_trivial_zero()
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