Modular Reduction in Abstract Polytopes

Abstract

AbstractThe paper studies modular reduction techniques for abstract regular and chiral polytopes, with two purposes in mind: first, to survey the literature about modular reduction in polytopes; and second, to apply modular reduction, with moduli given by primes in ℤ[τ] (with τ the golden ratio), to construct new regular 4-polytopes of hyperbolic types ﹛3, 5, 3﹜ and ﹛5, 3, 5﹜ with automorphism groups given by finite orthogonal groups.