I keep getting the terms confused:(adsbygoogle = window.adsbygoogle || []).push({});

1) if I have the equation

-Δr^{2}+c^{2}Δt^{2}=s^{2}

does one say that I am using the (-,-,-,+) signature?

2) Given the above , if s^{2}> 0 then the interval is space-like, and if s^{2}< 0 it is time-like, or is it vice-versa?

3) If I now use the proper time τ , is it the same (as far as signature, space-like and time-like) for -Δr^{2}+Δτ^{2}=R^{2}?

4) If R is the space-time radius of an arc in the above, what would that arc be?

Thanks for any help.

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# Quick check as to space-like and time-like

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