Starting with polynomial:
P : 3/2*t^2 - 1/2
Extension levels are: 2 13
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Trying to find an order 13 Kronrod extension for:
P1 : 3/2*t^2 - 1/2
Solvable: 1
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Ending with final polynomial:
P : 3/2*t^15 - 9527/1738*t^13 + 347711/43450*t^11 - 323869/54510*t^9 + 42861/18170*t^7 - 165711/345230*t^5 + 252343/5868910*t^3 - 32643/29344550*t
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Computing nodes and weights
  current precision for roots: 53
  current precision for roots: 106
 current precision for weights: 53
Linear system for weights solvable: 1
  current precision for roots: 106
  current precision for roots: 212
 current precision for weights: 106
Linear system for weights solvable: 1
Sufficient bits for target precision reached
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The nodes are:
| (0.9884484796115023493 + 5.8268286962501615182e-153j)  +/-  (1.09e-59, 1.09e-59j)
| (-0.57735026918962576451 - 7.255084558319292906e-159j)  +/-  (8.29e-61, 8.29e-61j)
| (-0.9884484796115023493 + 7.9848607109502335453e-157j)  +/-  (1.06e-59, 1.06e-59j)
| (0.57735026918962576451 - 7.3976189631300234996e-162j)  +/-  (8.68e-61, 8.68e-61j)
| (0.85251573770951683235 - 6.5944177920940298927e-171j)  +/-  (1.54e-59, 1.54e-59j)
| (0.73037509973747927166 - 4.5082852900452673767e-176j)  +/-  (5.22e-60, 5.22e-60j)
| (-0.2042156837128657121 - 3.4702846057481531295e-179j)  +/-  (6.23e-63, 6.23e-63j)
| (-0.73037509973747927166 + 1.5423487136658458354e-178j)  +/-  (5.23e-60, 5.23e-60j)
| (-0.39948019139974547251 - 5.7386216787762428054e-180j)  +/-  (8.22e-62, 8.22e-62j)
| (0.39948019139974547251 - 7.236819907413445959e-183j)  +/-  (9.06e-62, 9.06e-62j)
| (0.93941947667002316119 - 2.6753400258744488175e-187j)  +/-  (2.49e-59, 2.49e-59j)
| (0.2042156837128657121 + 3.2473847314908499437e-189j)  +/-  (5.07e-63, 5.07e-63j)
| (-0.93941947667002316119 - 8.4603840871724357334e-191j)  +/-  (2.24e-59, 2.24e-59j)
| (-0.85251573770951683235 + 1.8056608086084545916e-194j)  +/-  (1.52e-59, 1.52e-59j)
| (5.3375373565415864186e-212 - 1.2949329760653066181e-212j)  +/-  (8.24e-211, 8.24e-211j)
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The weights are:
| (0.02961414420590408982 - 7.3149870488568496009e-153j)  +/-  (7.24e-18, 3.29e-46j)
| (0.1665839048337182518 - 1.1821229884376256806e-153j)  +/-  (2.7e-18, 1.23e-46j)
| (0.02961414420590408982 - 8.6283872006929200135e-155j)  +/-  (1.58e-18, 7.16e-47j)
| (0.1665839048337182518 - 4.5046801962115421642e-153j)  +/-  (1.36e-18, 6.19e-47j)
| (0.10510091678597360621 - 7.6502884522820843338e-153j)  +/-  (7.25e-19, 3.29e-47j)
| (0.13845439360659989715 + 5.7419068628811888926e-153j)  +/-  (6.14e-19, 2.79e-47j)
| (0.20120637189340815276 - 1.9214142188556230701e-153j)  +/-  (9.5e-20, 4.31e-48j)
| (0.13845439360659989715 + 8.6134509709183029204e-154j)  +/-  (3.92e-20, 1.78e-48j)
| (0.18790726972540608396 + 1.5309398102575612007e-153j)  +/-  (5.89e-20, 2.67e-48j)
| (0.18790726972540608396 + 3.6086629817576034336e-153j)  +/-  (3.23e-20, 1.46e-48j)
| (0.068270689727528101116 + 1.1731452065403094862e-152j)  +/-  (1.6e-20, 7.18e-49j)
| (0.20120637189340815276 - 2.9224354796295556434e-153j)  +/-  (1.32e-20, 5.95e-49j)
| (0.068270689727528101116 + 2.9674339190112271732e-154j)  +/-  (5.01e-22, 2.21e-50j)
| (0.10510091678597360621 - 5.6383528181849273297e-154j)  +/-  (8.15e-22, 3.53e-50j)
| (0.20572461844292363435 + 2.3749973288063010281e-153j)  +/-  (1.15e-21, 6.42e-50j)
