Comment #3 on issue 2275 by sherjilo...@gmail.com: is_upper and is_lower should imply that the matrix is square
http://code.google.com/p/sympy/issues/detail?id=2275
So, basically if the user wants lower triangular matrix, he'll check for square and lower both separately. That's okay too. Just have to make sure the docstrings are clear about it. In pull 205, they say, "Check if matrix is an upper triangular matrix.". We'll have to revise that.
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