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To: Think4Yourself who wrote (256790)	6/25/2010 3:49:23 PM
From: dealmakr	Respond to of 306849

John Q "Einstein's two postulates are:" But how often do you get to use a word like postulate. Made my day, relativity speaking. dealmakr

To: Think4Yourself who wrote (256790)	6/25/2010 4:40:15 PM
From: neolib	Read Replies (1) \| Respond to of 306849

FWIW it appeared that you guys were talking past each other. You are quite correct that two observers, A & B might assign different velocities to C, and that those velocities are not linearly dependent on the relative velocity of A to B. For some reason, he took your sentence to mean that A and B would report different velocities for their mutual velocity. That is always the same of course. A & B might be approaching each other at near c (both agreeing on this value), and A could shoot a particle beam at B which would appear to A to leave at near c as well, while B would report the beam approaching at only near c too, not 2c as would be expected from the relative velocity of A & B.