Dear GAP Forum, This is to announce the release of GAP 4.7.7, which could be downloaded from
http://www.gap-system.org/Releases/ This release includes not only improvements and fixed bugs, but also two new GAP packages: - json package by Christopher Jefferson, providing a mapping between the JSON markup language and GAP; - SglPPow package by Bettina Eick and Michael Vaughan-Lee, providing the database of p-groups of order p^7 for p > 11, and of order 3^8. Also, Windows users may now use the standard installer http://www.gap-system.org/pub/gap/gap47/exe/gap4r7p7_2015_02_13-15_29.exe which since GAP 4.7.6 became an official format for the GAP distribution for Windows. Alternative installers for Linux and OS X (BOB and GAP Rsync) will hopefully be updated later. The overview of changes in GAP 4.7.7 versus GAP 4.7.6 is given below. New features: - Introduced some arithmetic operations for infinity and negative infinity. - Introduced new property 'IsGeneratorsOfSemigroup' which reflects whether the list or collection generates a semigroup. Fixed bugs which could lead to incorrect results: - Fixed a bug in 'Union' (actually, in the internal library function 'JoinRanges') caused by downward running ranges. [Reported by Matt Fayers] - Fixed a bug where recursive records might be printed with the wrong component name, coming from component names being ordered differently in two different pieces of code. [Reported by Thomas Breuer] - The usage of abs in src/gmpints.c was replaced by 'AbsInt'. The former is defined to operate on 32-bit integers even if GAP is compiled in 64-bit mode. That lead to truncating GAP integers and caused a crash in 'RemInt', reported by Willem De Graaf and Heiko Dietrich. Using 'AbsInt' fixes the crash, and ensures the correct behaviour on 32-bit and 64-bit builds. Fixed bugs that could lead to break loops: - A problem with 'ProbabilityShapes' not setting frequencies list for small degrees. [Reported by Daniel Błażewicz and independently by Mathieu Gagne] - An error when generating a free monoid of rank infinity. [Reported by Nick Loughlin] - Several bugs with the code for Rees matrix semigroups not handling trivial cases properly. - A bug in 'IsomorphismTypeInfoFiniteSimpleGroup' affecting one particular group due to a misformatting in a routine that translates between the Chevalley type and the name used in the table (in this case, "T" was used instead of ["T"]). [Reported by Petr Savicky] Other fixed bugs: - The 'Basis' method for full homomorphism spaces of linear mappings did not set basis vectors which could be obtained by 'GeneratorsOfLeftModule'. - A problem with 'GaloisType' entering an infinite loop in the routine for approximating a root. [Reported by Daniel Błażewicz] - Fixed the crash when GAP is called when the environment variables HOME or PATH are unset. [Reported by Bill Allombert] In addition to the two new packages mentioned above, GAP 4.7.7 distribution includes updates of 17 other GAP packages: Package name | Version | Date ------------------------------------------------ Circle | 1.5.3 | 13/02/2015 CoReLG | 1.20 | 02/12/2014 gpd | 1.31 | 17/12/2014 GradedModules | 2015.01.30 | 30/01/2015 HomalgToCAS | 2015.02.03 | 03/02/2015 idrel | 2.21 | 10/12/2014 json | 0.8.2 | 08/02/2015 kan | 1.11 | 10/12/2014 LiePRing | 1.8 | 08/11/2013 LocalizeRingForHomalg | 2014.11.20 | 20/11/2014 MatricesForHomalg | 2015.02.03 | 03/02/2015 Modules | 2015.02.10 | 10/02/2015 RingsForHomalg | 2015.02.10 | 10/02/2015 Semigroups | 2.2 | 20/01/2015 SglPPow | 0.9 | 21/11/2014 TomLib | 1.2.5 | 21/11/2014 ToolsForHomalg | 2014.12.08 | 08/12/2014 Wedderga | 4.7.2 | 24/11/2014 XMod | 2.31 | 17/12/2014 ================================================ We encourage all users to upgrade to GAP 4.7.7. 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 _______________________________________________ Forum mailing list Forum@mail.gap-system.org http://mail.gap-system.org/mailman/listinfo/forum
