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

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

  Jessica, Alejandro

• Implementation of k-tableaux and kcharge

  Anne, Jennifer

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

  Tom Roby, Darij, Jessica

• 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

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 (#13781, #13838, #13872)

  Anne, Travis

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)