= Maximal analytic extension
A <maximal analytic extension> of an analytic <spacetime> is an analytic <spacetime extension> admitting no further proper analytic extension as a regular spacetime of the same dimension. It is different from a <maximal Cauchy development>, which can end at a smooth <Cauchy horizon>. Additional global choices or quotients can affect uniqueness. The simply connected extension of positive-mass <Schwarzschild spacetime> through both horizons is the <Kruskal spacetime>; its <curvature singularities> remain boundaries.
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