Mellin Amplitudes for Supergravity on AdS5 x S5

We revisit the calculation of holographic correlation functions in type-IIB supergravity on AdS(5) x S-5. Results for four-point functions simplify drastically when expressed in Mellin space. We conjecture a compact formula for the four-point functions of one-half Bogomol'nyi-Prasad-Sommerfieldsingle-trace operators of arbitrary weight. Our methods rely on general consistency conditions and eschew detailed knowledge of the supergravity effective action.