Re: physical significance
From: Shmuel (Seymour J.) Metz (spamtrap_at_library.lspace.org.invalid)
Date: 12/15/04
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Date: Wed, 15 Dec 2004 00:02:33 -0500
In <200412131529.iBDFT2605675@proapp.mathforum.org>, on 12/13/2004
at 04:19 PM, not.adomain@foo.com (joccis) said:
>Often. Example, mechanics, energy is conserved iff the hamiltonian is
>unchanged as a result of time reversal, that is H(-t)=H(t).
No, energy is conserved iff the Hamiltonian is invariant under a
temporal shift, e.g, H(p,q,t)=H(p,q,t+k).
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