On May 5, 11:18�am, YBM wrote:
rbwinn wrote:
Einstein's own equations for
velocity of light do not work in the Lorentz equations if x or x' are
negative.

Wrong. They work.

No, they do not work. Einstein said that x=ct, x'=ct'. If x is
negative, then

t'=(t-vx/c^2)/sqrt (1-v^2/c^2)

cannot be used with the equation x=ct. The velocity of light has to
be -c in the equation for t' in order for the equation to work if x is
negative. x=(-c)t, not x=ct.
Robert B. Winn