[GAP Forum] GAP 4.6.4 release announcement

[Alexander Konovalov]

Dear GAP Forum,

This is to announce the release of GAP 4.6.4.

You can download GAP 4.6.4 from 

	http://www.gap-system.org/Releases/

The alternative GAP distributions listed at 

	http://www.gap-system.org/Download/#alternatives

will be updated in due course.

The overview of changes in GAP 4.6.4 is given below.

New functionality:

* New command line option -O was introduced to disable loading obsolete
variables. This option may be used, for example, to check that they are
not used in a GAP package or one's own GAP code.

Fixed bugs which could lead to incorrect results:

* Fixed the bug in NewmanInfinityCriterion which may cause returning
true instead of false. [Reported by Lev Glebsky]

Fixed bugs which could lead to crashes:

* Fixed the kernel method for Remove which did not raise an error in case
of empty lists, but corrupted the object. The error message in a library
method is also improved. [Reported by Roberto Ràdina]

Fixed bugs that could lead to break loops:

* Fixed requirements in a method to multiply a list and an algebraic
element. [Reported by Sebastian Gutsche]

* Fixed a bug in NaturalCharacter entering a break loop when being called
on a homomorphism whose image is not a permutation group. [Reported by
Sebastian Gutsche]

* Fixed a bug in ExponentsConjugateLayer which occured, for example, in
some calls of SubgroupsSolvableGroup [Reported by Ramon Esteban-Romero]

* Fixed a problem with displaying function fields, e.g.
Field(Indeterminate(Rationals,"x")). [Reported by Jan Willem Knopper]

* Fixed two bugs in the code for NaturalHomomorphismByIdeal for
polynomial rings. [Reported by Martin Leuner]

* Added  missing method for String for -infinity.

* Fixed the bug with ONanScottType not recognising product action
properly in some cases.

* The method for SlotUsagePattern for straight line programs had a bug
which triggered an error, if the straight line program contained
unnecessary steps.

You may also access this overview by scrolling till the end of the
chapter after entering  '?Changes between GAP 4.5 and GAP 4.6' in 
GAP 4.6.4, or view it online at

http://www.gap-system.org/Manuals//doc/changes/chap2.html#X82859C4083F0D7B9

In addition to the improved functionality and fixed bugs in the core 
GAP system listed above, several packages have been updated since the 
previous GAP 4.6.3 release:

================================================
Package name          | Version     | Date      
------------------------------------------------ 
AutoDoc               | 2013.01.16  | 16/01/2013
Example               | 3.4.3       | 27/03/2013
GradedRingForHomalg   | 2013.02.07  | 07/02/2013
MatricesForHomalg     | 2013.04.16  | 16/04/2013
Modules               | 2013.04.19  | 19/04/2013
OpenMath              | 11.1.4      | 27/03/2013
orb                   | 4.6         | 02/05/2013
RingsForHomalg        | 2013.04.19  | 19/04/2013
Smallsemi             | 0.6.6       | 24/04/2013
ToolsForHomalg        | 2013.04.16  | 16/04/2013
Wedderga              | 4.5.4       | 28/03/2013
================================================

We encourage all users to upgrade to GAP 4.6.4. 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.

Please note that we are regularly updating the GAP distribution to 
include new versions of GAP packages, but we may not announce each 
of them to the Forum. We intend to use the Forum to announce updates 
of the core GAP system and only of some packages which may fix serious 
issues or have major influence on GAP. 

Wishing you fun and success using GAP,

The GAP Group