... FLAMINI, AND R. MIRANDA• e : the cardinality of E, i.e. the number of irreducible components of double curves in X;• fn: the number of n-faces of G, i.e. the number of En-points of X, forn ... :=n3fn, the number of faces of G, i.e. the total number of En-points of X, for all n 3;• rn: the number of open n-faces of G, i.e. the number of Rn-points of X,for n 3;• ... the total number of Rn-points of X, for all n 3;• sn: the number of n-angles of G, i.e. the number of Sn-points of X, forn 4;• s:=n4sn: the total number of Sn-points of...