%0 Journal Article %T Co-Periodicity Isomorphisms between Forests of Finite <I>p</I>-Groups %A Daniel C. Mayer %J Advances in Pure Mathematics %P 77-140 %@ 2160-0384 %D 2018 %I Scientific Research Publishing %R 10.4236/apm.2018.81006 %X Based on a general theory of descendant trees of finite p-groups and the virtual periodicity isomorphisms between the branches of a coclass subtree, the behavior of algebraic invariants of the tree vertices and their automorphism groups under these isomorphisms is described with simple transformation laws. For the tree of finite 3-groups with elementary bicyclic commutator qu-otient, the information content of each coclass subtree with metabelian main-line is shown to be finite. As a striking novelty in this paper, evidence is provided of co-periodicity isomorphisms between coclass forests which reduce the information content of the entire metabelian skeleton and a significant part of non-metabelian vertices to a finite amount of data. %K Finite < %K i> %K p< %K /i> %K -Groups %K Descendant Trees %K Pro-< %K i> %K p< %K /I> %K Groups %K Coclass Forests %K Generator Rank %K Relation Rank %K Nuclear Rank %K Parametrized Polycyclic Pc-Presentations %K Automorphism Groups %K Central Series %K Two-Step Centralizers %K Commutator Calculus %K Transfer Kernels %K Abelian Quotient Invariants %K < %K i> %K p< %K /i> %K -Group Generation Algorithm %U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=82163