i follow the definition define theta in sympy, however got error at g =
CompositeMorphism(f, f) - IdentityMorphism(A)
Theta is involution of A <=> theta o theta = identitymorphism(A)
Book Conceptual Mathematic in page 139
A = Object("A")
B = Object("B")
f = NamedMorphism(A, B, "f")
g = CompositeMorphism(f, f) - IdentityMorphism(A)
g.domain
g.codomain
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