Comment #9 on issue 2338 by christian.muise: Use predicates and
propositions instead of "Assume objects"
http://code.google.com/p/sympy/issues/detail?id=2338
In some sense there is.
1. Q.even(x)
2. ~Q.even(x) >> Q.odd(x)
Both 1 and 2 are assumptions, but only 1 is a fact. Under the hood (of
the new assumption system), things are brought down into well formed
formulae of propositions. I'm equating fact with proposition here.
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