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Fix computation of all maximal subgroups (under specific circumstances, an incomplete list was returned) #4396

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merged 1 commit into from
Apr 14, 2021

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@hulpke hulpke commented Apr 13, 2021

Instead of storing one attribute and a flag that indicates that it might be
only a partial list, store potentially multiple lists and the restrictions
under which they were computed. This avoids a qualified result sneaking in
as true.
This fixes #4395

The correction unfortunately goes across a larger number of files, though most changes are tiny.

Instead of storing one attribute and a flag that indicates that it might be
only a partial list, store potentially multiple lists and the restrictions
under which they were computed. This avoids a qualified result sneaking in
as true.
This fixes gap-system#4395
@hulpke hulpke added kind: bug: wrong result Issues describing bugs that result in mathematically or otherwise wrong results, and PRs fixing them release notes: to be added PRs introducing changes that should be (but have not yet been) mentioned in the release notes priority: high labels Apr 13, 2021
@fingolfin fingolfin merged commit 3c2a640 into gap-system:master Apr 14, 2021
@fingolfin fingolfin changed the title FIX: Storage of partial maximal subgroup lists Fix computation of all maximal subgroups (under specific circumstances, an incomplete list was returned) Aug 17, 2022
@fingolfin fingolfin added release notes: use title For PRs: the title of this PR is suitable for direct use in the release notes and removed release notes: to be added PRs introducing changes that should be (but have not yet been) mentioned in the release notes labels Aug 17, 2022
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Bug in taking a maximals subgroups list that is quick and wrong as true.
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