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[Merged by Bors] - feat(linear_algebra/pi_tensor_product): add subsingleton_equiv #10274
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This is useful for constructing the tensor product of a single module, which we will ultimately need to show an isomorphism to
tensor_algebra
.This also refactors
pempty_equiv
to useis_empty
, which probably didn't exist at the time. This eliminates a surprising universe variable that was parameterizingpempty
.