\input zb-basic \input zb-ioport \iteman{io-port 03931634} \itemau{Poggi, Carla} \itemti{On a system of functional equations connected with the locality concept of information theory.} \itemso{Rend. Semin. Fac. Sci. Univ. Cagliari 52, No.2, 57-68 (1982).} \itemab The general form of the locality concept which is compatible with an assigned composition law is determined as solution of a system of functional equations. \itemrv{~} \itemcc{} \itemut{locality concept; composition law; system of functional equations} \itemli{} \end