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Saw this in a book last night. I hope I read it right and am remembering it right.
If two rectangular coordinate systems share the same x-axis and one is moving at a constant speed towards positive x and a beam of light is traveling along their x axes going towards the positive, then at the beam is at x=ct and x'=ct', one for each system.
The book says then x-ct=M(x'-ct') for some constant M.
What I don't get is doesn't x-ct=0=x'-ct' mean M is 1?
What am I not understanding about this?
If two rectangular coordinate systems share the same x-axis and one is moving at a constant speed towards positive x and a beam of light is traveling along their x axes going towards the positive, then at the beam is at x=ct and x'=ct', one for each system.
The book says then x-ct=M(x'-ct') for some constant M.
What I don't get is doesn't x-ct=0=x'-ct' mean M is 1?
What am I not understanding about this?