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Einstein Field Equations

G_{ u ho au u} = 8πG T_{ u ho au u} / c^4, describing the relationship between the geometry of spacetime and the distribution of mass-energy.

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The statement of the theorem

G_{\mu\nu} = \frac{8\pi G}{c^4} T_{\mu\nu}

\nWhere

G_{\mu\nu} = R_{\mu\nu} - \frac{1}{2} R g_{\mu\nu}

is the Einstein tensor, derived from the Ricci curvature tensor

R_{\mu\nu}

and the scalar curvature

R = g^{\mu\nu} R_{\mu\nu}

, and

T_{\mu\nu}

is the stress-energy tensor describing the source of gravity.

Source: Wikipedia