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Results tagged with spacetime
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user 368514
Within relativity (both special and general), changes of reference frames can change both the notions of space and of time, with one depending on the other as well. As a consequence, it is necessary to treat both concepts in a unified manner. Hence the term spacetime.
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Why is there a negative sign in the formula for proper time [duplicate]
I recently read in the footnotes of 'The Elegant Universe' by Brian Greene about the formula for proper time, defined as
$d\tau^2=dt^2-c^{-2}(dx_1^2+dx_2^2+dx_3^2)$.
I am new to the subject of Special …
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