Comment #26 on issue 1887 by asmeu...@gmail.com: Separate boolean and symbolic relationals
http://code.google.com/p/sympy/issues/detail?id=1887
There was recently a discussion on the maling list about this (actually issue 3105, but the key here is this issue). See https://groups.google.com/d/topic/sympy/TTmZMxpeXn4/discussion.
One thing I noted there is that Symbol has exactly the same problem as Relational. We currently have Symbol as both an Expr and a Boolean. But clearly we should have both. We could have intelligent coercion with things like x | y so that it automatically converts a Symbol to a BooleanSymbol, assuming that x and y don't have any assumptions on them that explicitly make them non-boolean. But whatever we do, the solution for Symbol and the solution for Relational should probably be more or less the same.
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