Issues

• Validate IGS in SubgroupByIgs (and add NC version?)

  gap-packages/polycyclic#272 · Filter by author stertooy opened on Oct 17, 2026

• CRRecordByPcp can fail for non-snf pcp's

  gap-packages/polycyclic#260 · Filter by author stertooy opened on Oct 15, 2026

• UnitriangularMatrixRepresentation and IsMatrixRepresentation don't work (correctly) for trivial input

  gap-packages/polycyclic#256 · Filter by author stertooy opened on Oct 14, 2026
  

• UnitriangularMatrixRepresentation and IsMatrixRepresentation actually use the group defined by the collector

  gap-packages/polycyclic#249 · Filter by author stertooy opened on Oct 14, 2026

• CRRecord functions cannot handle trivial module

  gap-packages/polycyclic#192 · Filter by author stertooy opened on Oct 3, 2026

• Add a function IsomorphismPcpGroupByIGS or so, which takes an IGS and computes a new pcp group isomorphic to the group generated by IGS

  enhancement
  gap-packages/polycyclic#184 · Filter by author fingolfin opened on Oct 2, 2026

• Make some code in gap/pcpgrp/tensor_nq.gi a package extension?

  gap-packages/polycyclic#164 · Filter by author stertooy opened on Oct 1, 2026

• Implement ConjugacySubgroupsBySeries

  gap-packages/polycyclic#163 · Filter by author stertooy opened on Oct 1, 2026

• Feature request: SemidirectProduct (and DirectProduct) with polycyclic groups that aren't PcpGroups

  gap-packages/polycyclic#131 · Filter by author stertooy opened on Sep 28, 2026
  1

• Error in fallback for KernelOfCongruenceMatrixAction

  gap-packages/polycyclic#123 · Filter by author stertooy opened on Jul 16, 2026

• Use GAP package extension feature (introduced in GAP 4.13) to break cyclic dependency with alnuth

  gap-packages/polycyclic#94 · Filter by author fingolfin opened on Dec 9, 2024

• Different behaviour in 2.16 and 2.17dev for AbelianPcpGroup if some of the given orders are 1

  gap-packages/polycyclic#92 · Filter by author ThomasBreuer opened on Nov 22, 2024
  2

• Add/improve input validation for Pcp, Ngs, Cgs, others... ?

  gap-packages/polycyclic#75 · Filter by author fingolfin opened on Aug 8, 2022

• Idea: Make (most of) the collector immutable once its been used to create a group

  enhancement
  gap-packages/polycyclic#14 · Filter by author fingolfin opened on Dec 29, 2016
  1

• assertion in SubgroupByIgs when computing a torsion subgroup

  question
  gap-packages/polycyclic#1 · Filter by author fingolfin opened on Dec 27, 2016
  3