"Source: Text/Geometry/Toric.text";
"Line: 2318";
"Date: Thu Sep 25 14:47:45 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Geometry/Toric.text, line: 2318
// Example: H129E15 ()
print "Example: H129E15";
ei := GetEchoInput();
SetEchoInput(true);
L := ToricLattice(3);
C := PositiveQuadrant(L);
v := L![1/7,2/7,5/7];
LL,phi := AddVectorToLattice(v);
CC := Cone(phi(Rays(C)));
CC;
FF := Fan(CC);
vv := phi(v);
vv;
GG := Blowup(Fan(CC),vv);
X := ToricVariety(Rationals(),FF);
Y<x,y,z,t> := ToricVariety(Rationals(),GG);
f := ToricVarietyMap(Y,X);
f;
KX := CanonicalDivisor(X);
KY := CanonicalDivisor(Y);
KY - Pullback(f,KX);
SetEchoInput(ei);
