D.16.2.16 isGorenstein

Syntax:

Polymake::isGorenstein( polytope p )

Type:

int

Purpose:

1 if p is Gorenstein, i.e. reflexive after dilitation and translation, 0 otherwise.

Example:

LIB"polymake.lib"; ==> Welcome to polymake ==> Copyright (c) 1997-2012 ==> Ewgenij Gawrilow, Michael Joswig (TU Darmstadt) ==> http://www.polymake.org intmat M[4][3]=1,1,0, 1,0,1, 1,0,0, 1,1,1; polytope p = polytopeViaPoints(M); Polymake::isGorenstein(p); ==> polymake: used package cdd ==> cddlib ==> Implementation of the double description method of Motzkin et al. ==> Copyright by Komei Fukuda. ==> http://www.ifor.math.ethz.ch/~fukuda/cdd_home/cdd.html ==> ==> 1 intmat N[3][3]=1,2,0, 1,0,2, 1,-2,-2; polytope q = polytopeViaPoints(N); Polymake::isGorenstein(q); ==> 0