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I have now began to read a new book called space-time physics by Edwin.F.Taylor.

In the first chapter(parable of surveyors),First it talks about invariant interval and it says the equation is:

## \sqrt{ (ct)^2 - x^2 } ##

In Wikipedia,i saw a different answer for the same invariant interval:

## \sqrt{ r^2 - (ct)^2 } ##

Anyway i think ## x ## in first one is same as ## r ## in second one.

So what is actually happening here?

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# Confused on how to calculate invariant interval.

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