Changes between Version 3 and Version 4 of Ticket #7729


Ignore:
Timestamp:
Dec 18, 2009, 4:26:02 PM (13 years ago)
Author:
bump
Comment:

I posted a new version. This version works either before or after the patch in #7718.

Legend:

Unmodified
Added
Removed
Modified
  • Ticket #7729 – Description

    v3 v4  
    1313The following issues remain.
    1414
    15 * It may require some revision in order to follow Sage's coercion model. David Roe suggested that the _coerce_impl method should be removed.
    16 
    17 * The get_action method is a kludge to avoid the crash reported in #7725. That crash is fixed by David Roe's patch in #7718, but this patch does not work with the patch in #7718.
     15* David Roe suggested that the _coerce_impl method should be removed. I have not looked at this yet.
    1816
    1917* It should be made to work with Affine Weyl groups. I have not checked whether this requires further modification.
     
    2119* Subjectively, it seems a little slow compared with a previous implementation for type A only. This is probably a limitation of the {{{WeylGroup()}}} class on which it depends. My earlier implementation was based on Permutation. If it proves unacceptably slow it may be possible to speed it up by a caching scheme.
    2220
     21* Later I may add a method to compute intertwining elements which depend on spectral parameters. These have applications to representations of p-adic groups.
     22
    2323For some further discussion of this topic see
    2424http://groups.google.com/group/sage-combinat-devel/browse_thread/thread/78fc23f23cafe705?hl=en