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• 14:24, 5 July 2023 Admin talk contribs deleted page Gravitational instanton (content was: "{{Short description|Four-dimensional complete Riemannian manifold satisfying the vacuum Einstein equations}} In mathematical physics and differential geometry, a '''gravitational instanton''' is a four-dimensional complete Riemannian manifold satisfying the vacuum Einstein equations. They are so named because they are analogues in quantum theories of gravity of instantons in Yang–Mills theory. In accordan...")