gentoo Easter resync : 12.04.2020

1 files changed, 16 insertions, 1 deletions

diff --git a/sci-mathematics/gfan/metadata.xml b/sci-mathematics/gfan/metadata.xml
index abc08ece6082..c9e1ddd54b35 100644
--- a/sci-mathematics/gfan/metadata.xml
+++ b/sci-mathematics/gfan/metadata.xml
@@ -6,6 +6,21 @@
   <name>Gentoo Mathematics Project</name>
  </maintainer>
 <longdescription lang="en">
-  gfan is a computer algebra tool to compute Groebner fans and tropical varieties.
+  Gfan is a software package for computing Gröbner fans and tropical
+  varieties. These are polyhedral fans associated to polynomial
+  ideals. The maximal cones of a Gröbner fan are in bijection with the
+  marked reduced Gröbner bases of its defining ideal. The software
+  computes all marked reduced Gröbner bases of an ideal. Their union
+  is a universal Gröbner basis. The tropical variety of a polynomial
+  ideal is a certain subcomplex of the Gröbner fan. Gfan contains
+  algorithms for computing this complex for general ideals and
+  specialized algorithms for tropical curves, tropical hypersurfaces
+  and tropical varieties of prime ideals. In addition to the above
+  core functions the package contains many tools which are useful in
+  the study of Gröbner bases, initial ideals and tropical
+  geometry. The full list of commands can be found in Appendix B of
+  the manual. For ordinary Gröbner basis computations Gfan is not
+  competitive in speed compared to programs such as CoCoA, Singular
+  and Macaulay2.
 </longdescription>
 </pkgmetadata>