Comment #13 on issue 388 by [email protected]: NotImplementedError in matrices
http://code.google.com/p/sympy/issues/detail?id=388
The NotImplementedError is because Matrix isn't a subclass of Basic and behaves quite differently (instances are mutable, no .args attribute, ...). Having bools showing up inside Basic objects is bad enough, but allowing Matrix objects as well would be a nightmare.
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