Home Online Manual
Top
Back: isLatticeEmpty
Forward: isReflexive
FastBack:
FastForward:
Up: polymake_lib
Top: Singular Manual
Contents: Table of Contents
Index: Index
About: About this document

D.13.4.32 isNormal

Procedure from library polymake.lib (see polymake_lib).

Usage:
isNormal(p); p polytope

Return:
1, if the projective toric variety defined by p is projectively normal; 0 otherwise

Example:
 
LIB "polymake.lib";
==> Welcome to polymake version
==> Copyright (c) 1997-2015
==> Ewgenij Gawrilow, Michael Joswig (TU Darmstadt)
==> http://www.polymake.org
intmat M[6][4]=
1,1,1,2,
1,-1,-1,-2,
1,1,0,0,
1,-1,0,0,
1,0,1,0,
1,0,-1,0;
polytope p = polytopeViaPoints(M);
isNormal(p);
==> polymake: used package 4ti2
==>   4ti2 -- A software package for algebraic, geometric and combinatorial p\
   roblems on linear spaces.
==>   Copyright by 4ti2 team.
==>   http://www.4ti2.de/
==> 
==> polymake: used package ppl
==>   The Parma Polyhedra Library (PPL): A C++ library for convex polyhedra
==>   and other numerical abstractions.
==>   http://www.cs.unipr.it/ppl/
==> 
==> 0