Hardy-Littlewood 1920s + Vinogradov 1937: Waring's problem + Goldbach via Fourier analysis on T = R/Z; major arcs (rationals) + minor arcs (irrationals); Vinogradov's mean-value theorem.
Hardy-Littlewood 1920s + Vinogradov 1937: Waring's problem + Goldbach via Fourier analysis on T = R/Z; major arcs (rationals) + minor arcs (irrationals); Vinogradov's mean-value theorem.