These Thurston maps are NET maps for every choice of translation term. They are primitive and have degree 13. PURE MODULAR GROUP HURWITZ EQUIVALENCE CLASSES FOR TRANSLATIONS {0} {lambda1} {lambda2} {lambda1+lambda2} These pure modular group Hurwitz classes each contain infinitely many Thurston equivalence classes. The number of pure modular group Hurwitz classes in this modular group Hurwitz class is 24. ALL THURSTON MULTIPLIERS c/d IN UNREDUCED FORM 0/13, 1/13, 1/1, 2/1, 3/1, 4/1, 5/1, 6/1, 7/1, 10/1, 11/1 EXCLUDED INTERVALS FOR THE HALF-SPACE COMPUTATION (-infinity,0.000000) ( 0.000000,0.086957) ( 0.087190,0.089123) ( 0.102602,infinity) The half-space computation does not determine rationality. EXCLUDED INTERVALS FOR JUST THE SUPPLEMENTAL HALF-SPACE COMPUTATION INTERVAL COMPUTED FOR HST OR EXTENDED HST (-0.040204,0.018224) 0/1 EXTENDED HST ( 0.085597,0.088822) 2/23 EXTENDED HST -> HST ( 0.088952,0.089662) 5/56 HST ( 0.089365,0.090096) 7/78 HST ( 0.090026,0.090325) 11/122 HST ( 0.090034,0.090579) 15/166 HST ( 0.090484,0.090673) 25/276 HST ( 0.090611,0.090737) 35/386 HST ( 0.090729,0.091082) 1/11 EXTENDED HST ( 0.091053,0.091199) 39/428 HST ( 0.091122,0.091264) 30/329 HST ( 0.091191,0.091421) 22/241 HST ( 0.091288,0.091660) 16/175 HST ( 0.091457,0.091854) 11/120 HST ( 0.091700,0.091937) 9/98 HST ( 0.091888,0.092277) 7/76 HST ( 0.092192,0.092954) 5/54 HST ( 0.092611,0.093807) 4/43 EXTENDED HST -> HST ( 0.093023,0.094118) 3/32 EXTENDED HST -> HST ( 0.093717,0.094496) 8/85 HST ( 0.094322,0.094357) 5/53 EXTENDED HST ( 0.094340,0.094891) 7/74 HST ( 0.094814,0.095039) 13/137 HST ( 0.094984,0.095098) 23/242 HST ( 0.094972,0.095238) 33/347 HST ( 0.095111,0.095358) 2/21 EXTENDED HST ( 0.095238,0.095745) 19/199 HST ( 0.095496,0.095676) 13/136 HST ( 0.095643,0.096912) 3/31 EXTENDED HST -> HST ( 0.096693,0.097453) 7/72 HST ( 0.096981,0.097863) 23/236 HST ( 0.097531,0.097592) 4/41 EXTENDED HST ( 0.097826,0.100000) 5/51 HST ( 0.099644,0.100386) 1/10 EXTENDED HST ( 0.100386,0.101266) 13/129 HST ( 0.100792,0.101663) 9/89 HST ( 0.101198,0.102898) 5/49 EXTENDED HST -> HST ( 0.102197,0.103638) 4/39 EXTENDED HST -> HST The supplemental half-space computation shows that these NET maps are rational. SLOPE FUNCTION INFORMATION NUMBER OF FIXED POINTS: 8 EQUATOR? FIXED POINT c d 0 lambda1 lambda2 lambda1+lambda2 -10/1 1 13 Yes Yes No No -8/1 1 13 Yes Yes No No 0/1 1 13 Yes Yes No No -32/3 1 13 Yes Yes No No -48/5 1 13 Yes Yes No No -72/7 1 13 Yes Yes No No -120/11 1 13 Yes Yes No No -74/7 1 13 Yes Yes No No NUMBER OF EQUATORS: 8 8 0 0 There are no more slope function fixed points. Number of excluded intervals computed by the fixed point finder: 1383 No nontrivial cycles were found. 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 either one of the above cycles or 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,b,b,b,b,b,b,b^-1,b^-1,b^-1,b^-1,b^-1,b^-1>(2,13)(3,12)(4,11)(5,10)(6,9)(7,8)", "b=(1,13)(2,12)(3,11)(4,10)(5,9)(6,8)", "c=<1,c^-1,c^-1,c^-1,c^-1,c^-1,c^-1,c,c,c,c,c,c*d>(2,13)(3,12)(4,11)(5,10)(6,9)(7,8)", "d=<1,1,c^-1,c^-1,c^-1,c^-1,c^-1,c,c,c,c,c,c>(1,2)(3,13)(4,12)(5,11)(6,10)(7,9)", "a*b*c*d"); When the translation term of the affine map is lambda1: NewSphereMachine( "a=(1,13)(2,12)(3,11)(4,10)(5,9)(6,8)", "b=(1,12)(2,11)(3,10)(4,9)(5,8)(6,7)", "c=(1,13)(2,12)(3,11)(4,10)(5,9)(6,8)", "d=<1,c^-1,c^-1,c^-1,c^-1,c^-1,c^-1,c,c,c,c,c,c*d>(2,13)(3,12)(4,11)(5,10)(6,9)(7,8)", "a*b*c*d"); When the translation term of the affine map is lambda2: NewSphereMachine( "a=(1,13)(2,12)(3,11)(4,10)(5,9)(6,8)", "b=<1,c^-1,c^-1,c^-1,c^-1,c^-1,c^-1,c,c,c,c,c,c*d>(2,13)(3,12)(4,11)(5,10)(6,9)(7,8)", "c=(1,13)(2,12)(3,11)(4,10)(5,9)(6,8)", "d=(1,12)(2,11)(3,10)(4,9)(5,8)(6,7)", "a*b*c*d"); When the translation term of the affine map is lambda1+lambda2: NewSphereMachine( "a=(1,12)(2,11)(3,10)(4,9)(5,8)(6,7)", "b=(1,13)(2,12)(3,11)(4,10)(5,9)(6,8)", "c=(1,12)(2,11)(3,10)(4,9)(5,8)(6,7)", "d=(1,11)(2,10)(3,9)(4,8)(5,7)(12,13)", "a*b*c*d");