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Mar2-12, 01:05 AM
Sci Advisor
P: 5,437
There are two ways to classify different metrics:
(1) different solutions
(2) different coordinates

Think about the equation ax˛+bx+c=0. There are two solutions x1,2 (this corresponds to 1) and of course you can make a change of coordinates x'=x-a (this corresponds to 2)