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**"Introduction to Quantum Mechanics - Third Edition," by Richard Liboff**

Does anyone here have "Introduction to Quantum Mechanics - Third Edition," by Richard Liboff?

I'd like some help with the way he explains Hermite functions. In the problems he says to prove a the relation

exp(2zt - t^2) = sum(k = 0 - infinty) H_n(z)t^n/n!

Which, of course, is done with a Taylor series expansion. It appears that Liboff wants the reader to prove this with the inormation that he gives in that section regarding H_n(z). But I don't see that its at all obvious.

Anyone?

Pete