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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 -- Check out my homepage: http://landau.ucdavis.edu/psalzman/index.html -=><=-+-+-=><=-+-+-=><=-+-+-=><=-+-+-=><=-+-+-=><=-+-+-=><=-+-+-=><=-+-+-=><=- Do you hate spam? Join the Coalition Against Unsolicited Commercial Email (CAUCE) at http://www.cauce.org. Actions speak louder than words. Join Today! I BOYCOTT ANY COMPANY THAT USES MASS ADVERTISING ON THE INTERNET