How can I generate, or is it possible to generate tree topologies by the topologies_ function? For example, 1-loop 4-point function in the phi^3 theory:
V p1,...,p99,q1,...,q99;
Set pp:p1,...,p99;
Set qq:q1,...,q99;
#define NLOOPS "0"
#define NLEGS "4"
L F = topologies_(`NLOOPS',`NLEGS',{3,},qq,pp);
P +sss;
.end
Unfortunately, it gives
FORM 4.2.1 (Feb 6 2019, v4.2.1-2-g087a772) 64-bits Run: Thu Mar 7 12:56:40 2019
F = 0;
In general, which kind of topologies are supposed to be generated by this function (currently and in a future)? I mean, there is no specification of, for example, "one-particle-irreducible" in the manual.
How can I generate, or is it possible to generate tree topologies by the
topologies_function? For example, 1-loop 4-point function in the phi^3 theory:Unfortunately, it gives
In general, which kind of topologies are supposed to be generated by this function (currently and in a future)? I mean, there is no specification of, for example, "one-particle-irreducible" in the manual.