Combinatorics

• Implementing Stanley chromatic symmetric function for posets

  Mathieu, Eric, Alejandro, Chris

• Implementing boards for rook placements, Le diagrams (#14127)

  • implementing Le diagrams
  • include CombinatorialMaps if possible
  • adding documentation and doctests

  Alejandro, Kevin (testing/doctests)

• Flow polytopes from permutation matrices and alternating sign matrices (#14654)

  Jessica, Alejandro

• Implementation of k-tableaux and kcharge

  Anne, Jennifer, Mike

• Combinatorial actions and orbit averages on posets, order polytopes, and rational functions

  Tom Roby, Darij, Jessica, Kevin

• Combinatorial Species

  Martin Rubey, Thursday and Friday only

  • code cleanup
  • generation of unlabelled objects for composition and functorial composition via a group action framework
  • multisort species (multivariate formal power series would be useful for that)
  • add code by Andrew for Gamma-species
  • support operations from symmetric function code for cycle index series

• Conclude OEIS ticket #10358 (rebase after #13701, last doctests, and make urls clickable from the notebook

  ThierryMonteil

• More switches from CombinatorialClass to category framework

  Travis

• Implement LaTeX options for parking functions

  Mike

• implement composition tableaux as a combinatorial class

  Mike, Chris

• beef up NSym/QSym functionality - dual bases, quasi-Schur and dual's, basis by Pieri rule, map to free algebra, P-partitions, Hazewinkel's lambda-Lyndon basis, quasi-Schurs

  Mike, Matthieu Deneufchâtel, Darij, Chris

• Finish affine symmetric group patch

  Tom, Chris

• Implement BWSym and related Hopf algebras

  Olivier Mallet, Ali Chouria

• Posets - Close outstanding tickets, optimize counting linear extensions, add poset examples (absolute order on symmetric group, etc.)

  Kevin

Representation Theory

• Finalize non-symmetric Macdonald polynomial patch

  Anne, Nicolas

• Implement monomial crystals (first version in combinat queue)

  Ben, Travis

• Refactor and speedup of all crystals code (#14516, #14686, more to come)

  Travis

• Make progress on fixing/reviewing rigged configurations patches (#13871, #13838, #13872)

  Anne, Travis

• Representations of quivers and quiver algebras: Finish refactoring Jim's code (#12630)

  Simon

Categories and infrastructure

Nicolas, Simon, Travis

• Review #10963 more functorial constructions
• Review #11111 finite dimensional modules
• Nested class name mangling: Understand why building the pdf documentation hangs with the patch from #9107
• Plan the follow ups

Documentation

Travis

• Reorganize combinat documentation

Teaching

Other

• Finish CFF #14567 review (ThierryMonteil)

• Trac-ify some of the bugs found via ask.sagemath.org and discuss about better integration between those two useful tools (ThierryMonteil)

• Work on making RIF and CIF more reliable (ThierryMonteil)

• Add parallel cloning to Sage Debian Live USB key (ThierryMonteil)

• FindStat work

  Travis, Viviane, Chris