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*From*: Moses Fayngold <moshfarlan@yahoo.com>*Date*: Fri, 1 Oct 2010 08:37:05 -0700 (PDT)

Sorry, this is to correct the typo.

I wrote a few minutes ago (on Fri, October 1, 2010 11:15:44 AM ):

Thus, your "proof by contradiction" does not prove anything,

and definitely does not disprove my initial statement P = m U

for a photon. This definition remains useful to show immediately

that the norm of the photon's 4-momentum is zero, since |U| = 0.

The last part in the last sentence must read: "since |U| = 1".

This typo does not change anything in my conclusions.

Moses Fayngold,

NJIT

**References**:**Re: [Phys-l] Absolute four-momentum of massless particles***From:*Moses Fayngold <moshfarlan@yahoo.com>

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