Sage-Combinat: enhancing Sage as a toolbox for computer exploration in algebraic combinatorics

Sage-Combinat is a software project whose mission is: to improve the open source mathematical system Sage as an extensible toolbox for computer exploration in (algebraic) combinatorics, and foster code sharing between researchers in this area.

In practice, Sage-combinat is a collection of branches on top of Sage, developed by a community of researchers. The intent is that most of those branches get eventually integrated into Sage as soon as they are mature enough, with a typical short life-cycle of a few weeks. In other words: just install Sage, and you will benefit from all the Sage-combinat development, except for the latest bleeding edge features.

NEWS

• Road map and current status

• Experimental Sage notebook with the Sage-Combinat patches applied

• A new poster for Sage-Combinat!

• Help for new Git workflow

Past news

• August 14-17, 2014 Sage Days 60, Chennai, India

• April 7-11, 2014 Sage(-Combinat) Days 57, Cernay, France

• November 4-8, 2013 Sage(-Combinat) Days 54, University of California at Davis, USA

  • Organized by Dan Bump, Anne Schilling and Travis Scrimshaw

• June 17-21, 2013 Sage(-Combinat) days 49, in Orsay as satellite event to FPSAC'13

  • Organized by Alejandro Morales, Anne Schilling, Nicolas M. Thiery

• January 28 - May 3, 2013: ICERM Semester Program on "Automorphic Forms, Combinatorial Representation Theory and Multiple Dirichlet Series", with a strong Sage and Sage-Combinat component, ICERM, Brown, USA

• February 11-15, 2013 Sage Days: Multiple Dirichlet Series, Combinatorics, and Representation Theory, ICERM, Brown, USA

  • Organized by Franco Saliola, Anne Schilling, Nicolas M. Thiery

• January 21-25, 2013 Online Databases:from L-functions to combinatorics, Edinburgh

  • Organized by Paul-Olivier DeHaye, Nicolas M. Thiery.

• October 29 - November 9, 2012: CIMPA summer school Discrete mathematics : combinatorial, dynamical and algorithmic aspects, with a strong Sage and Sage-Combinat component, Bobo Dioulasso, Burkina Faso

• July 9-13 2012: Sage(-Combinat) Days 40: Algebraic Combinatorics, IMA, Minneapolis, USA

  • Organized by Gregg Musiker, Franco Saliola, Anne Schilling, Nicolas M. Thiery.

• May 7-11 2012: Sage(-Combinat) Days 38: algebraic combinatorics and the representation theory of algebras, Centre de recherches mathématiques, Montréal, Canada

• April 18-th 2012: Coxeter/Cluster algebra afternoon at the Paris Sage User Group meeting

• February 8-10 2012: Sage and cluster algebra workshop, University of Hannover

• February 6-10 2012: Sage-Combinat Days Cernay 2012

• March 19-23 2012: EJC du GDR-im a Rennes site officiel

• May 2-6, 2011: Sage Days 30: Combinatorics (Schubert calculus, cluster algebras) and Number theory (integer vectors, multidimensional digit representations) in Acadia University, Wolfville, Nova Scotia, Canada

  • Organized by Eva Curry and Hugh Thomas.

• January 17-19, 2011: Sage days 28: dynamics, geometry, and analytic combinatorics in Orsay

• July 10, 2010: First release of Calcul Mathématique avec Sage

  • A 315 pages open source french introductory book on computational mathematics, illustrated in Sage, and including a 35 pages chapter on combinatorics (and soon one on graph theory).

• July 7-15, 2010: Affine Schubert Calculus workshop and summer school in Toronto

  • It includes several Sage and Sage-Combinat sessions. Organized by Anne Schilling and Mike Zabrocki.

• June 14-18, 2010: Joint Sage-Combinat and Chevie Workshop in Orsay

• May 3-7, 2010: Sage Days 20.5 in Toronto

  • Organized by Nantel Bergeron, FrancoSaliola and Mike Zabrocki, again with a serious algebraic combinatorics slant

• February 22-26, 2010: Sage days 20

  • The thematic month MathInfo 2010 at CIRM, Marseille included a Sage days week. FlorentHivert, NicolasThiéry, and FrancoSaliola were among the organizers and there was a serious combinatorics slant.

• July 25-29, 2009: *-Combinat 2009

  • We held an International Sage Workshop on Free and Practical Software for Algebraic Combinatorics at RISC, Linz, Austria, right after FPSAC'09

• May 25th, 2009: The Sage-words library demonstrated at the 2nd Canadian Discrete and Algorithmic Mathematics Conference CanaDAM'09 Sage worksheet, PDF.

• April 15th, 2009: Software demonstration accepted for FPSAC'09 PDF, LaTeX Source LaTeX bibliography

• January 26-30, 2009: Sage-Combinat Workshop in Orsay

• 2008-06-19: MuPAD-Combinat join forces with Sage

  • Sage-combinat was born as a partial port of MuPAD-Combinat. After months of discussions and experiments, an enthusiastic consensus emerged in the MuPAD-Combinat community to join Sage. Sage-combinat henceforth became the natural successor of MuPAD-Combinat.

  • The transition was a massive investment (and is not yet completely over): seven years of hard work to port over! However a lot of experience was gained since 2000, and most of the design was pretty clear, and we could *share* the work.

Who are we? What is Sage-Combinat used for?

• Contributors

• Institutions and sponsors

• Grant applications

• Publications citing Sage-Combinat

• Cite Sage-Combinat when you use it for research publications.

• Plume's review pages on Sage-Combinat: English and French

• Sage-Combinat's poster

• Cool pictures we produced with Sage-Combinat for our research

How to participate and contribute

Communication

• Join our mailing lists:
  • Announcement mailing list (to come)

  • sage-combinat-devel: Developers' mailing list

  • sage-combinat-commits: A low traffic mailing list which receives an automatic notice whenever a sage-combinat related ticket is modified (and eventually whenever a commit is done on the patch server).

  • sage-combinat-days: Mailing list for the organisation of Sage-Combinat days

• Check the road map and current status

• Post bug reports, suggestions, patches on the Sage-Combinat trac server or on the mailing list.

Code

Since Sage 6.0, the development workflow has been reworked in depth, and we are in the progress of migrating the extensions as git branches. Here are some useful links:

• Closed tickets related to combinatorics

• In-progress tickets related to combinatorics

• Some conventions and help with the new git

The Sage-Combinat extensions used to be managed as a collection of patches on our patch server, using a so-called mercurial queue. Quite some stuff below is thus outdated, and will be progressively replaced by information on the new workflow.

• Browse the Sage sources with the Sage-combinat patches applied (only useful for Sage version prior to sage-6.0)

• Developing for Sage-Combinat on Windows: Sage Development on Windows.

Design

• Have a look and participate to design discussions.

• Contribute to the list of quirks and weirdness issues in the *-Combinat design.

Documentation

• Browse the Sage documentation with the Sage-combinat patches applied

  • And in particular the Thematic tutorials

• Mercurial server for miscelleanous files and documents (Usage instructions)

• Some tips and tricks about the documentation system

Links

• The Combinatorial Software and Databases web page maintained by Christian Krattenthaler