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No trace of trace!


So I'm doing my QFT homework, and I need to know what the matrices A and
B would look like if

    Tr[A] Tr[B] = Tr[AB]

were true.  (For example, it's true if A=B=1 or if A=-B=1).  I quickly 
walk over to my computer desk, sit down and power up Mathematica.  I
enter two  matrices and type Trace[A] and got wierd output.

So I go to help and find out Trace is not a matrix operation.

After looking for close to 5 minutes, I've concluded that the Trace
*matrix* operation is either not present or well hidden.

Can someone tell me which one?

Pete

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