Starting with polynomial:
P : t
Extension levels are: 1 2 10
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Trying to find an order 2 Kronrod extension for:
P1 : t
Solvable: 1
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Trying to find an order 10 Kronrod extension for:
P2 : t^3 - 3/5*t
Solvable: 1
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Ending with final polynomial:
P : t^13 - 124943/42780*t^11 + 576433/179676*t^9 - 310453/189658*t^7 + 10439/27094*t^5 - 97669/2763588*t^3 + 3421/4605980*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:
| (0.98189373966174310941 - 5.0900960611935157903e-142j)  +/-  (7.84e-61, 7.84e-61j)
| (-0.98189373966174310941 - 5.0052077379577523111e-147j)  +/-  (8.09e-61, 8.09e-61j)
| (-0.90591989788431806766 - 2.1311236071773242262e-147j)  +/-  (1.84e-60, 1.84e-60j)
| (-0.17101852249474448773 - 4.1953166613001162931e-154j)  +/-  (2.75e-63, 2.75e-63j)
| (0.59706738604131558719 + 3.0566400066358593494e-171j)  +/-  (2.05e-61, 2.05e-61j)
| (0.77459666924148337704 - 1.5187025517082079172e-183j)  +/-  (9.48e-61, 9.48e-61j)
| (3.2263433617403692745e-190 - 9.8193058835576456181e-190j)  +/-  (1.34e-188, 1.34e-188j)
| (-0.77459666924148337704 + 2.9878745045682550238e-189j)  +/-  (9.17e-61, 9.17e-61j)
| (-0.59706738604131558719 - 9.6439611356369733749e-192j)  +/-  (2.05e-61, 2.05e-61j)
| (0.17101852249474448773 - 4.9797908409470917063e-190j)  +/-  (2.75e-63, 2.75e-63j)
| (0.90591989788431806766 + 9.205599265835292767e-192j)  +/-  (1.7e-60, 1.7e-60j)
| (0.38736385932378655649 + 5.2256807065210414881e-198j)  +/-  (3.01e-62, 3.01e-62j)
| (-0.38736385932378655649 - 2.6313394670897578294e-203j)  +/-  (2.93e-62, 2.93e-62j)
-------------------------------------------------
The weights are:
| (0.046315472084977675075 + 6.6853894769549348148e-142j)  +/-  (7.69e-20, 2.45e-49j)
| (0.046315472084977675075 + 1.1997491273464219595e-143j)  +/-  (3.33e-20, 1.06e-49j)
| (0.10482358739979075702 - 4.541856182206226049e-143j)  +/-  (2.68e-20, 8.53e-50j)
| (0.20325381324263158191 - 9.7506846488771221459e-142j)  +/-  (6.43e-21, 2.05e-50j)
| (0.19648084401046957789 - 8.6229437457458254632e-142j)  +/-  (3.35e-21, 1.07e-50j)
| (0.15630315613221364749 + 8.7819564760805129841e-142j)  +/-  (2.04e-21, 6.5e-51j)
| (0.14736469563100595519 + 1.5052894551950596695e-141j)  +/-  (3.15e-21, 9.98e-51j)
| (0.15630315613221364749 + 1.0363774907393007474e-142j)  +/-  (7.8e-22, 2.47e-51j)
| (0.19648084401046957789 - 2.1015413185506244421e-142j)  +/-  (4.56e-22, 1.46e-51j)
| (0.20325381324263158191 - 1.386371070525429804e-141j)  +/-  (3.21e-22, 1.05e-51j)
| (0.10482358739979075702 - 1.1288112382901836214e-141j)  +/-  (2.71e-23, 9.05e-53j)
| (0.21914077931441378302 + 1.0043685578970359119e-141j)  +/-  (1.6e-22, 5.36e-52j)
| (0.21914077931441378302 + 4.3608999321199823543e-142j)  +/-  (9.47e-23, 2.52e-52j)
