Changes

:::GR generally operates in curved spacetime; in SR spacetime is always flat. But if you plug a flat spacetime into the equations of GR, SR is what falls out. The connection is not only quite deep, but very useful too; in any smooth, curved space, one can always pick a sufficiently small patch such that curvature can be safely neglected. In practical terms, this means that any observer can always choose to work within a region of spacetime small enough to make SR an arbitrarily good approximation. [[User:Tsumetai|Tsumetai]] 04:07, 29 March 2007 (EDT)

:::GR generally operates in curved spacetime; in SR spacetime is always flat. But if you plug a flat spacetime into the equations of GR, SR is what falls out. The connection is not only quite deep, but very useful too; in any smooth, curved space, one can always pick a sufficiently small patch such that curvature can be safely neglected. In practical terms, this means that any observer can always choose to work within a region of spacetime small enough to make SR an arbitrarily good approximation. [[User:Tsumetai|Tsumetai]] 04:07, 29 March 2007 (EDT)