Comment #1 on issue 3105 by [email protected]: (a < b) & (c < d) does not work
http://code.google.com/p/sympy/issues/detail?id=3105

This used to work in 0.6.7, but was broken in 0.7.0. I bisected it to this commit:

commit 635d89c3c53fd84cc884e0ab62dc3f03480fe76a
Author: Ronan Lamy <[email protected]>
Date:   Tue Apr 6 05:20:04 2010 +0100

    Create boolean base class logic.boolalg.Boolean.

Magic methods for logic operators were moved from Basic to the new class.
    This required a lot of import-fiddling.

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