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Look at Einstein's "Relativity: the special and general theory". Let us
assume that A is the postulate of the constancy of the speed of light:
A: x = ct <-> x' = ct'
which is a biconditional and can be read: if and only if x=ct then
x'=ct'. Then Einstein introduces a relation of which A is obviously a
corollary (Einstein
explicitly recognizes this):
B: (x' - ct') = L(x - ct)