Comment #5 on issue 1928 by [email protected]: Boolean algebra
inconsistencies
http://code.google.com/p/sympy/issues/detail?id=1928
def test_Equivalent():
A, B, C = map(Boolean, symbols('ABC'))
- assert Equivalent(A, B) == Equivalent(B, A)
+ assert Equivalent(A, B) == Equivalent(B, A) == Equivalent(A, B, A)
+ assert Equivalent() == True
+ assert Equivalent(A, A) == Equivalent(A) == True
+ assert Equivalent(True, True) == Equivalent(False, False) == True
+ assert Equivalent(True, False) == Equivalent(False, True) == False
+ assert Equivalent(A, True) == A
+ assert Equivalent(A, False) == Not(A)
What's missing?
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