          MODULE=gfan
         VERSION=0.5
          SOURCE=$MODULE$VERSION.tar.gz
      SOURCE_URL=http://www.math.tu-berlin.de/~jensen/software/gfan/
SOURCE_DIRECTORY=$BUILD_DIRECTORY/$MODULE$VERSION
      SOURCE_VFY=sha1:ba4f3e4fac6bcafdfdd2244329d925e958d9ee63
        WEB_SITE=http://www.math.tu-berlin.de/~jensen/software/gfan/gfan.html
         ENTERED=20110326
         UPDATED=20110326
           SHORT="computing Grbner fans and tropical varieties"

cat << EOF
Gfan is a software package for computing Grbner fans and tropical varieties. 
These are polyhedral fans associated to polynomial ideals. The maximal cones of
a Grbner fan are in bijection with the marked reduced Grbner bases of its 
defining ideal. The software computes all marked reduced Grbner bases of an 
ideal. Their union is a universal Grbner basis. The tropical variety of a 
polynomial ideal is a certain subcomplex of the Grbner fan.
EOF
