Comment #1 on issue 1887 by asmeurer: Relational should subclass Boolean, not Expr
http://code.google.com/p/sympy/issues/detail?id=1887
I guess it should be a Boolean in order to do things like x > y => Assume(x - y, Q.positive).
Also, I think just about all Expr methods on a relational should just apply themselves to the lhs and rhs (except for inequalities when it would not be correct). Is there any way to make it do this automatically, for Eq at least?
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