diff --git a/projection.out b/projection.out index 6afb851..84494b2 100644 --- a/projection.out +++ b/projection.out @@ -6,3 +6,12 @@ n=7 , m=10 graph gap = 1 projection gap = 2 factor=2 [1 0 0 1 0 0 1 0 0 0 1] [0 1 0 0 1 0 0 1 0 0 1] [0 0 1 0 0 1 0 0 1 1 1] +n=8 , m=14 graph gap = 1 projection gap = 15/7 factor=15/7 max=2.1428571428571432 +[1 1 1 0 0 0 0 0 0 0 0 0 0 0 1] +[0 0 0 1 1 1 0 0 0 0 0 0 0 0 1] +[0 0 0 0 0 0 1 1 1 0 0 0 0 0 1] +[0 0 0 0 0 0 0 0 0 1 1 1 0 0 1] +[0 0 0 0 0 0 0 0 0 0 0 0 1 1 1] +[1 0 0 1 0 0 1 0 0 1 0 0 0 0 1] +[0 1 0 0 1 0 0 1 0 0 1 0 1 0 1] +[0 0 1 0 0 1 0 0 1 0 0 1 0 1 1] diff --git a/projection.sage b/projection.sage index e12b9c1..eedf659 100644 --- a/projection.sage +++ b/projection.sage @@ -1,5 +1,6 @@ # cogirth-packing gap of projections of graphic matroids # see if gap(projection) <= 2 * gap(graph) +# this is wrong. see the last matrix in projection.out from sage.all import * from sage.matroids.all import *