When you study entropy: "The time development operator in quantum theory is unitary, because the Hamiltonian is hermitian." Uh-huh.
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@michael_nielsen can you tell me what it means?
@RitaJKing Hmm. Explanation depends a bit on your math background. Most useful thing for me to know: have you studied matrices at all?
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@michael_nielsen *very* minimally -
@RitaJKing But you remember what a matrix is (basically, an array of numbers)? - 5 more replies
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