The weak virtual periodicity conjecture for maximal coclass trees

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Let r∈N0r\in\mathbb N_0 and let KK be an arbitrary field. For an algebra AA in Gr,K\mathcal G_{r,K}, write T(A)\mathcal T(A) for the rooted subgraph consisting of all paths starting at AA. A maximal coclass tree is a coclass tree containing a unique maximal infinite path and satisfying the maximality condition from the source. Let T\mathcal T be such a tree, with maximal infinite path A1→A2→⋯A_1\to A_2\to\cdots, and let T‾(A)\overline{\mathcal T}(A) denote its unlabelled version rooted at AA. Weak virtual periodicity conjecture. There exist positive integers ll and kk such that

T‾(Al)≅T‾(Al+k).\overline{\mathcal T}(A_l)\cong\overline{\mathcal T}(A_{l+k}).

This conjecture predicts eventual periodicity of the unlabelled maximal coclass trees and would imply finite width. Its resolution is not supplied here.

References

Primary source

Andreas Distler and Bettina Eick, “Coclass theory for nilpotent semigroups via their associated algebras”, arXiv:1208.4383 (2012).

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