Comment #2 on issue 3496 by [email protected]: Assumptions known_facts
only apply to atomic expressions
http://code.google.com/p/sympy/issues/detail?id=3496
How are you forming X and Y?
This is from the current master branch
mrocklin@notebook:~/workspace/sympy$ git pull sympy master
mrocklin@notebook:~/workspace/sympy$ bin/isympy
In [1]: X = MatrixSymbol('X', n, n)
In [2]: Y = MatrixSymbol('Y', n, n)
In [3]: ask(Q.lower_triangular(X+Y), Q.lower_triangular(X) &
Q.lower_triangular(Y))
Out[3]: True
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