Parameterized Post-Newtonian (PPN) formalism is a theoretical framework used in the field of gravitation, particularly in the study of strong-field effects in general relativity and alternative theories of gravity. PPN allows researchers to compare and analyze different gravitational theories by expressing their predictions in a common framework, making it easier to test these theories against observational data. The PPN formalism is built on the Newtonian limit of gravitational theories.
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