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s^2=/_\r^2-c^2/_\t^2

it is the euclidean spacetime interval equation

you type \[ \text{\[ s^2 = r^2 - c^2 t^2 \] } \]

It will become
\[s^2 = r^2 - c^2 t^2 \]

there are delta symbols before r and t

\[\text{ \[ s^2 = \Delta \r^2 - c^2 \Delta t^2 \] } \]

\[s^2 = \Delta r^2 - c^2 \Delta t^2 \]

oh thank you very much...

:)

Spacetime isn't Euclidean, by the way. Did you have a question about that equation?

so no problem abt the unit

though its mathematical pls explain...