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MAINT: SymPy 1.5 compatibility #251
SymPy 1.5 release candidate 1 is out now. There is one breakage: EmptySet is now a singleton instead of a class (see release notes ).
Here is the simplest change. We also need to bump the requirements to pin sympy>=1.5.
There are a couple other options for changes:
Staying with comparing to the singleton makes sense to me. I'm opening this PR for discussion. We cannot merge this until SymPy 1.5 is released.