@Override
        public Traversal<Vertex, Double> get_g_V_outE_mathX0_minus_itX_byXweightX() {
            // https://issues.apache.org/jira/browse/TINKERPOP-1979 - should work in OLAP
            return g.V().outE().math("0-_").by("weight");
        }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/MathTest.java