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Yearly Archives: 2019

CoDiMa training plans for early 2020

December 16, 2019

We are organising two events in January-February 2020:

GAP 4.10.2 release

July 2, 2019

GAP 4.10.2 has been released in June 2019 and can be downloaded from the GAP website here. In addition to updates in the core GAP system, it contains 145 packages, including updated versions of 55 packages from GAP 4.10.1 distribution. A new package redistributed with GAP is MonoidalCategories by Mohamed Barakat, Sebastian Gutsche and Sebastian Posur. It is based on the CAP package and implements monoidal structures for CAP. See the release overview in the Changes manual and the release announcement in the GAP Forum for further details.

Orbital graphs and constructive matrix recognition

May 23, 2019

Paula Hähndel (Martin-Luther-Universität Halle-Wittenberg) writes on her visit to St Andrews in Spring 2019, supported by CoDiMa:

“My stay in St Andrews was a great opportunity to meet the local GAP community. I was encouraged to continue my improvements of parts of the GAP documentation, and I used some of my time during my stay to do so. I also continued to discuss some ideas about orbital graphs with Markus Pfeiffer. One part of this was discussing ways to construct groups that have interesting orbital graphs, which would provide good test cases for the search algorithms that are developed by Wilf Wilson, Chris Jefferson and Markus.

I also gave a talk about constructive matrix group recognition and the discussion (mainly with Mun See Chang, Wilf and Chris) continued afterwards. We also discussed many of the details that are needed for implementation, but that were not addressed in the talk. This hopefully was a good preparation for the Summer School on Matrix Group Recognition in Aachen this year that us four will attend together. I am thankful for the opportunity to come. It was a really nice and productive time in St Andrews.”

GAP 4.10.1 release

March 4, 2019

GAP 4.10.1 has been released in February 2019 and can be downloaded from the GAP website here. In addition to updates in the core GAP system, it contains 145 packages, including updated versions of 35 packages from GAP 4.10.0 distribution, and also five new packages:

  • MajoranaAlgebras by Markus Pfeiffer and Madeleine Whybrow, which constructs Majorana representations of finite groups.
  • PackageManager by Michael Torpey, providing a collection of functions for installing and removing GAP packages, with the
    eventual aim of becoming a full pip-style package manager for the GAP system.
  • Thelma by Victor Bovdi and Vasyl Laver, implementing algorithms to deal with threshold elements.
  • walrus by Markus Pfeiffer, providing methods for proving hyperbolicity of finitely presented groups in polynomial time.
  • YangBaxter by Leandro Vendramin and Olexandr Konovalov, which provides functionality to construct classical and skew braces, and also includes a database of classical and skew braces of small orders.

See the release overview in the Changes manual and the release announcement in the GAP Forum for further details.