Dear GAP Forum,
This is to announce the release of GAP 4.7.5.
You can download GAP 4.7.5 from
http://www.gap-system.org/Releases/
The GAP installer for Windows and the BOB installer for Linux and OS X
listed at
http://www.gap-system.org/Download/#alternatives
are now providing GAP 4.7.5 as well.
The overview of changes in GAP 4.7.5 versus GAP 4.7.4 is given below.
Fixed bugs which could lead to incorrect results:
* InstallValue cannot handle immediate values, characters or booleans
for technical reasons. A check for such values was introduced to
trigger an error message and prevent incorrect results caused by this.
[Reported by Sebastian Gutsche]
* KnowsDictionary and LookupDictionary methods for
IsListLookupDictionary were using PositionFirstComponent; the latter
is only valid on sorted lists, but in IsListLookupDictionary the
underlying list is NOT sorted in general, leading to bogus results.
Other fixed bugs:
* A bug in DirectProductElementsFamily which used
CanEasilyCompareElements instead of CanEasilySortElements.
* Fixed wrong Infolevel message that caused a break loop for some
automorphism group computations.
* Fixed an error that sometimes caused a break loop in HallSubgroup.
[Reported by Benjamin Sambale]
* Fixed a rare error in computation of conjugacy classes of a finite
group by homomorphic images, providing fallback to a default algorithm.
* Fixed an error in the calculation of Frattini subgroup in the case
of the trivial radical.
* Several minor bugs were fixed in the documentation, kernel, and
library code for transformations.
* Fixed errors in NumberPerfectGroups and NumberPerfectLibraryGroups
not being aware that there are no perfect groups of odd order.
* Restored the ability to build GAP on OS X 10.4 and 10.5 which was
accidentally broken in the previous GAP release by using the build
option not supported by these versions.
* Fixed some problems for ia64 and sparc architectures. [Reported by
Bill Allombert and Volker Braun]
In addition to the improved functionality and fixed bugs in the
core GAP system, a new package "permut" by A.Ballester-Bolinches,
E.Cosme-Llópez, and R.Esteban-Romero to deal with permutability
in finite groups has been accepted by the GAP Council and added
for the redistribution, and another 19 packages have been
updated:
Package name | Version | Date
----------------------+-------------+-----------
AutoDoc | 2014.03.27 | 27/03/2014
Browse | 1.8.5 | 20/02/2014
cvec | 2.5.1 | 04/04/2014
Float | 0.5.18 | 27/01/2014
genss | 1.6.1 | 04/04/2014
GradedModules | 2014.02.25 | 25/02/2014
GradedRingForHomalg | 2014.02.04 | 04/02/2014
homalg | 2014.04.07 | 07/04/2014
IO | 4.3.1 | 04/04/2014
MatricesForHomalg | 2014.04.08 | 08/04/2014
nq | 2.5.1 | 02/04/2014
orb | 4.7.1 | 04/04/2014
permut | 1.01 | 15/04/2014
Polenta | 1.3.2 | 01/04/2014
RadiRoot | 2.7 | 09/04/2014
recog | 1.2.2 | 04/04/2014
recogbase | 1.2.2 | 04/04/2014
Semigroups | 2.0 | 17/04/2014
Smallsemi | 0.6.8 | 24/02/2014
ToolsForHomalg | 2014.04.10 | 10/04/2014
We encourage all users to upgrade to GAP 4.7.5. If you need any
help or would like to report any problems, please do not hesitate
to contact us at supp...@gap-system.org.
Wishing you fun and success using GAP,
The GAP Group
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