Logarithmic Enriques surfaces, II

w h e r e C 2 . 1 . 1 := g GL (2; C) is a cyclic subgroup , ;o f order 21 generated by g being a prim itiv e 2I-th root of the unity.(3) Ev ery V satisfies the Hypothesis (A).T he above n, U " and V" are uniquely determined by the original surface V (cf.Theorem 2.11 i n § 2 ) .W e shall describe precisely v a n d U" in Theorems 3 .1 -9 .1 .As consequences, we will have : M ain T heorem .W ith th e assumptions an d notations of T heorem 2.11', we describe in T ables 1, 2, 3, 5, 7 all possible distributions of singular points on a n d on U " as well as th e Picard num ber of K.