Compositions: ribbon decomposition and minor improvements

[darijgr]

The attached file implements near-concatenation and ribbon decomposition of compositions as well as their wll-ordering. Also it makes some little optimizations and corrections.

CC: @sagetrac-sage-combinat @tscrim @nthiery

Component: combinatorics

Keywords: combinat, compositions

Author: Darij Grinberg

Reviewer: Travis Scrimshaw

Merged: sage-5.13.beta0

Issue created by migration from https://trac.sagemath.org/ticket/15122

[fchapoton]

comment:2

the role for ArXiv is :arxiv: and not :arXiv:

[darijgr]

comment:3

Thanks, fixed. This issue appears in a zillion other places, though... Can't we create an alias in whatever code builds the doc?

[fchapoton]

comment:4

well, it seems that :arXiv: works, as well as :ARxiv: or any other choice of capitals..

[tscrim]

comment:5

Hey Darij,

A minor thing, but could you shorten the error message on line 442 to something like "{} is not the same size as {}".format(self, other)? Looks good to me otherwise.

Thanks,

Travis

[tscrim]

Reviewer: Travis Scrimshaw

[jdemeyer]

comment:7

The PDF documentation doesn't build:

! Extra }, or forgotten $.
<recently read> }
                 
l.14467 $\dot$
               or the near-concatenation sign $\odot$ (see
? ]
! Emergency stop.
<recently read> }
                 
l.14467 $\dot$
               or the near-concatenation sign $\odot$ (see
!  ==> Fatal error occurred, no output PDF file produced!