TY - JOUR AU - H. Światak TI - Connections between symmetry or asymmetry of the equations $f_1(x_1+...+x_n) = ∑_{(i_1},...,i_n)} f(x_i_1)...f_n(x_i_n)$ and their solutions JO - Annales Polonici Mathematici PY - 1967 SP - 257 EP - 269 VL - 19 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/ap-19-3-257-269/ DO - 10.4064/ap-19-3-257-269 LA - en ID - 10_4064_ap_19_3_257_269 ER -