Comment #1 on issue 2756 by [email protected]: Implement MatrixFunction
http://code.google.com/p/sympy/issues/detail?id=2756

Hrm, the Symbol(...)(t) syntax is new to me.
A temporary fix might be to disable this syntax for MatrixSymbols until someone builds a MatrixFunction class. I may get to this but its not likely to be in the immediate future.

More long term is the goal here to have matrix valued functions? What are some compelling use cases? Most of the time when I think of derivatives and matrices I think more of gradients of vector valued functions, not differentiating w.r.t. a matrix symbol (although this happens too of course).

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