Comment #2 on issue 1645 by jorn.baayen: [PATCH] Can not expand or simplify  
piecewise functions
http://code.google.com/p/sympy/issues/detail?id=1645

Here is an alternative fix that does not change the sympification of  
booleans. All
tests pass.

Attachments:
        0001-check-for-presence-of-__contains__-attribute.patch  783 bytes
        0002-support-ExprCondPair-arguments-in-constructor.patch  2.4 KB

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