Opened 13 years ago

Last modified 13 years ago

#8154 closed enhancement

Enhencement for crystals — at Version 4

Reported by: Anne Schilling Owned by: Sage Combinat CC user
Priority: major Milestone: sage-4.3.3
Component: combinatorics Keywords: combinatorics, crystals, KR crystals
Cc: Sage Combinat CC user Merged in:
Authors: Anne Schilling Reviewers:
Report Upstream: N/A Work issues:
Branch: Commit:
Dependencies: Stopgaps:

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Description (last modified by Anne Schilling)

New features for crystals:

  • Started framework for general highest weight crystals in /combinat/crystals/highest_weight.py (with contributions from Nicolas M. Thiery)
  • Implementation of finite dimensional highest weight crystals for type E6 and E7
  • Added new class for direct sums of crystals in /combinat/crystals/direct_sum.py
  • Added a new crystal morphism function for acyclic crystals
  • Added the Demazure operators on crystals
  • Added Demazure characters for finite crystals in the ambient weight lattice
  • Added _test_fast_iter method to compare two different ways of creating list of classical crystals

New features for Kirillov-Reshetikhin crystals:

  • Implementation of Kirillov-Reshetikhin crystals B{r,s} of type E_6{(1)} for r=1,2,6
  • Pointer to KirillovReshetikhin? crystals given in /combinat/crystals/affine.py (as requested by Dan Bump)
  • Added R-matrix for tensor product of two KR crystals

Bug fix:

  • Fixed whitespace problems in /combinat/crystals/crystals.py /combinat/crystals/kirillov_reshetikhin.py /combinat/crystals/affine.py /combinat/crystals/spins.py /combinat/crystals/tensor_products.py /combinat/crystals/fast_crystals.py /combinat/crystals/letters.py

Depends on trac ticket #7978 (trac_7978_crystal_cleanup-as.patch)

Change History (5)

comment:1 Changed 13 years ago by Anne Schilling

Description: modified (diff)

comment:2 Changed 13 years ago by Anne Schilling

Status: newneeds_review

comment:3 Changed 13 years ago by Anne Schilling

Description: modified (diff)

Changed 13 years ago by Anne Schilling

Attachment: trac_8154_affine-E-as.patch added

comment:4 Changed 13 years ago by Anne Schilling

Description: modified (diff)
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