These Thurston maps are NET maps for every choice of translation term.
They are primitive and have degree 7.
PURE MODULAR GROUP HURWITZ EQUIVALENCE CLASSES FOR TRANSLATIONS
{0} {lambda1} {lambda2} {lambda1+lambda2}
Since no Thurston multiplier is 1, this modular group Hurwitz class
contains only finitely many Thurston equivalence classes.
The number of pure modular group Hurwitz classes
in this modular group Hurwitz class is 4.
ALL THURSTON MULTIPLIERS c/d IN UNREDUCED FORM
0/7, 2/1
EXCLUDED INTERVALS FOR THE HALF-SPACE COMPUTATION
(-infinity,infinity)
The half-space computation determines rationality.
The supplemental half-space computation is not needed.
These NET maps are rational.
SLOPE FUNCTION INFORMATION
There are no slope function fixed points because every
nonzero multiplier is at least 1 and the map is rational.
Similarly, there are not even any slope function cycles.
The slope function maps some slope to the nonslope.
The slope function orbit of every slope p/q with |p| <= 50
and |q| <= 50 ends in the nonslope.
If the slope function maps slope p/q to slope p'/q', then |q'| <= |q|
for every slope p/q with |p| <= 50 and |q| <= 50.
FUNDAMENTAL GROUP WREATH RECURSIONS
When the translation term of the affine map is 0:
NewSphereMachine(
"a=<1,1,d*a*d^-1,d*b*c,d*a,b*c,c^-1>(2,3)(4,5)(6,7)",
"b=<1,1,1,1,1,1,1>(2,3)(4,5)(6,7)",
"c=<1,1,1,1,1,1,c>(1,2)(3,4)(5,6)",
"d=<1,1,d*a*d^-1,d*b*c,d*a,b*c,1>(1,2)(3,4)(5,6)",
"a*b*c*d");
When the translation term of the affine map is lambda1:
NewSphereMachine(
"a=<1,1,1,b*c,d*a,b*c,d*a>(2,3)(4,5)(6,7)",
"b=<1,a,1,1,d,b,1>(2,3)(4,5)(6,7)",
"c=<1,1,1,1,1,1,1>(1,2)(3,4)(5,6)",
"d=<1,1,a,a^-1,d*a,b*c,c>(1,2)(3,4)(5,6)",
"a*b*c*d");
When the translation term of the affine map is lambda2:
NewSphereMachine(
"a=<1,1,d*b*c,d*a*d^-1,b*c,d*a,1>(1,2)(3,4)(5,6)",
"b=<1,1,1,1,1,1,c>(1,2)(3,4)(5,6)",
"c=<1,1,1,1,1,1,1>(2,3)(4,5)(6,7)",
"d=<1,d*a*d^-1,1,d*a,d*b*c,c^-1,b*c>(2,3)(4,5)(6,7)",
"a*b*c*d");
When the translation term of the affine map is lambda1+lambda2:
NewSphereMachine(
"a=<1,1,a^-1,a,b*c,d*a,c>(1,2)(3,4)(5,6)",
"b=<1,1,1,1,1,1,1>(1,2)(3,4)(5,6)",
"c=<1,a,1,1,d,b,1>(2,3)(4,5)(6,7)",
"d=<1,a,a^-1,a,a^-1,c^-1,c>(2,3)(4,5)(6,7)",
"a*b*c*d");