... type of a cellular map, j : X → Y , where:(i) Both X and Y are minimal CW-complexes.(ii) At the level of k-skeletons, X(k)= Y(k), and the restriction of j to X(k)is the identity.Proof. ... graded chain complex of the universal coverLet X beaconnected CW -complex of finite type, with fundamental groupπ := π1(X), and universal coverX. The explicit determination of the boundarymaps, ... chain complexes (18) ⊗ and (19). Therefore, ε :gr∗IC∗(X) ⊗→is acyclic, and this finishes the proof of Proposition 22.Let A be an essential projective arrangement of rank r ≥ 3, with...