On Friday, June 1, 2018 at 7:25:21 PM UTC+10, Bruce wrote: > > I am confused about the interface between SkewTableaux and Tableaux. > I suspect this is something people are aware of. > > The points I have come across (and I doubt these are the only ones) are: > > A SkewTableau can be created from a chain of partitions using the keyword > chain. > This does not work for Tableau. There is a work around: > given a chain of partitions which starts with the empty partition, > create the skew tableau using the chain keyword, > convert to a list, > use this to construct a tableau. >
Most likely because nobody implemented it. Please add. > > Evacuation and promotion are not defined for skew tableaux. > Is this because the definition does not make sense or because > no-one has yet included them? > IDK. My initial thought is that these are well-defined, but I don't know if you get the usual properties for skew tableaux (and hence, are "uninteresting"). Yet, it is most likely the latter case. > > Mathematically, a tableau is a skew tableau with empty inner shape. > Many (most?) methods make sense for skew tableaux. > Ideally, these methods would be defined for skew tableaux > and made available to straight tableaux. I don't know the > appropriate mechanism for doing this in sage but I expect > people have ideas or even plans on this. > I believe part of the reason for this is that it takes a bit of extra processing power (not to mention code) to check for the None's that can appear in a skew tableau. Plus the general class hierarchy for the (skew) tableau code needs some cleanup (there is at least one stalled ticket toward this effect). -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-combinat-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-combinat-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-combinat-devel. For more options, visit https://groups.google.com/d/optout.
