Dominique Leuenberger
addaf11379
- Update to release 2.17 OBS-URL: https://build.opensuse.org/request/show/1310768 OBS-URL: https://build.opensuse.org/package/show/openSUSE:Factory/gap-polycyclic?expand=0&rev=2
71 lines
3.3 KiB
Plaintext
71 lines
3.3 KiB
Plaintext
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Sat Oct 11 18:36:26 UTC 2025 - Jan Engelhardt <jengelh@inai.de>
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- Update to release 2.17
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* Add a method `SemidirectProduct( N, alpha, G)` where `N` and
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`G` are both PcpGroups.
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* Enhance `AbelianPcpGroup` and `AbelianGroupCons` to support
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`infinity` in the list of orders.
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* Enhance `Centralizer` to fall back on generic GAP methods, so
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it can be computed in more cases.
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* Fixed a bug in `AbelianGroup` and `AbelianGroupCons` methods
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for `IsPcpGroup` and also in `AbelianPcpGroup`,
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`DihedralPcpGroup`, which resulted in either an unexpected
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break loop or in a corrupted group when used to create a group
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with some but not all generators of order 1
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* Support and use NC versions of `PreImages`, `PreImagesElm`,
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`PreImagesSet` and `PreImagesRepresetnative`.
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Sat Nov 19 00:50:37 UTC 2022 - Jan Engelhardt <jengelh@inai.de>
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- Update to release 2.16
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* Add support for random sources to Random method for pcp-groups.
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* Documented IsPcpGroup and IsPcpElementCollection.
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* Increased rank for IsomorphismPcGroup and IsomorphismFpGroup
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methods for pcp-groups, to ensure they are still used when
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all GAP packages are loaded.
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* Fix a bug in `NormalIntersection` which could lead to wrong
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results; this also affected other operations, such `Core`,
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`Intersection`.
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* Fix `PreImagesRepresentative` for trivial homomorphisms (it
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used to return the identity fo the source as preimage for all
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elements in the range, instead of returning fail for all but
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the identity of the range).
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-------------------------------------------------------------------
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Thu Nov 15 00:19:22 UTC 2018 - Jan Engelhardt <jengelh@inai.de>
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- Update to new upstream release 2.14
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* Improved performance of some orbit algorithms by using
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dictionaries.
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* Improved performance of AddToIgs for some examples where it
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previously performed very badly.
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* Added custom IsSingleValued method for group homomorphisms
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whose Source is an polycyclic groups, which can avoid an
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endless loop when the range is an infinite group.
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* Fixed bug in NormalizerPcpGroup, ComplementClassesCR,
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OrbitIntegralAction, and StabilizerIntegralAction, which
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could result in a break loop.
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* Fixed bug in AddToIgs for infinite groups which could result
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in an invalid output leading to strange results.
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* Fixed IsConjugate for pcp group elements to always return
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true and false (instead of an element which conjugates the
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inputs to each other).
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* Deprecated NaturalHomomorphism, use
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NaturalHomomorphismByNormalSubgroup instead (which is a
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standard GAP operation).
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* Replaced immediate methods for IsTorsionFree and
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IsFreeAbelian by implications, which have zero overhead,
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while immediate methods can slow down GAP.
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* Improved performance of UnitriangularPcpGroup for large n
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* Fixed a bug in OneCoboundariesCR which lead to an error in
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OneCohomologyCR.
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* Fixed a bug where the normal closure of an abelian subgroup
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could end up being flagged as abelian, even though it was not.
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-------------------------------------------------------------------
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Fri May 10 13:47:02 UTC 2013 - jengelh@inai.de
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- Split polycyclic (version 2.11) off the gap RPM package
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