Status: Accepted
Owner: asmeurer
Labels: Type-Defect Priority-Medium
New issue 2659 by asmeurer: IndexedBase should be commutative by default
http://code.google.com/p/sympy/issues/detail?id=2659
As far as I can tell, there is no way to make a commutative IndexedBase
object. I think it should be like every other Symbol object, and be
commutative by default, and require commutative=False in the constructor to
be commutative.
Right now, if you do IndexedBase('a', commutative=True), you get
AssertionError: ('inconsistency between facts', {'real': False, 'even':
False, 'irrational': False, 'nonpositive': False, 'composite':
False, 'zero': False, 'integer': False, 'imaginary': False, 'odd':
False, 'nonzero': True, 'commutative': False, 'prime': False, 'noninteger':
False, 'negative': False, 'nonnegative': False, 'complex':
False, 'rational': False, 'positive': False}, 'commutative', True).
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