What Is Spacetime?
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A 4 dimensional manifold with 3 dimensions of space and 1 dimension of time. Its metric is
dS^2 = dx^2 + dy^2 + dz^2 - dt^2
Notice the minus sign before the time term. This is the only thing that makes time different from space.
dS^2 = dx^2 + dy^2 + dz^2 - dt^2
Notice the minus sign before the time term. This is the only thing that makes time different from space.
Jeffrey K
· 4 weeks ago
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It is a name for the first 4 dimensions. -
Spacetime = space + time. Or mathematically, space^2 - time^2. -
Trust me. Just look it up.
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