[GAP Forum] GAP 4.7.5 release announcement

[Alexander Konovalov]

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 support at gap-system.org.


Wishing you fun and success using GAP,

The GAP Group