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stub for Cauchy surface
I made a technical correction, and added Idea and Applications.
Thanks.
I am not quite following where the reference to a “theory of everything” comes from, though.
Actually, it probably shouldn’t be there; in a theory that includes gravity, you can’t know what’s a Cauchy surface until after you’ve solved the equations. I’ve fixed that.
added pointer to:
added (here) statement of Bernal & Sánchez 2005, Thm. 1.1 that a smooth globally hyperbolic spacetime admits a smooth foliation by smooth spacelike Cauchy surfaces.
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