Flavour physics at CLEO-c

Three CLEO-c results related to flavour-physics are presented: the determination of the strong-phase difference between D0→K+π− and D0→K−π+, δ, the measurement of the coherence parameter and average strong-phase difference between D0→K+π−π−π+ and D0→K−π+π+π− and measurements of the variation of strong-phase difference between D0 and decays to over phase space. All measurements are important for determining the unitarity triangle angle γ from B→D(∗)K(∗) decays. Furthermore, the measurement of δ is important for interpreting mixing.