Regge calculus, formalism for producing simplicial approximations of spacetimes
The calculus was introduced by the Italian theoretician Tullio Regge in the early 1960s.
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In general relativity, Regge calculus is a formalism for producing simplicial approximations of spacetimes that are solutions to the Einstein field equation.
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This notion of simplicial manifold is important in Regge calculus and Causal dynamical triangulations as a way to discretize spacetime by triangulating it.
Tullio Regge (born 1931), Italian physicist, developer of Regge calculus and Regge theory