- #26

Dale

Mentor

- 29,727

- 6,065

I like this line of reasoning very much, except that I am not sure about this step. I don't understand why this would follow.Given that, in this limiting case we require that ds2=0=ds′2ds2=0=ds′2ds^{2}=0=ds'^{2}, then in general, we must have thatds′2=F(t,x,y,z)ds2ds′2=F(t,x,y,z)ds2ds'^{2}=F(t,x,y,z)ds^{2}