Starting with polynomial:
P : 2*t
Extension levels are: 1 4
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Trying to find an order 4 Kronrod extension for:
P1 : 2*t
Solvable: 1
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Ending with final polynomial:
P : 2*t^5 - 10*t^3 + 15/2*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:
| (2.0201828704560856329 - 3.4395525670743494409e-136j)  +/-  (4.08e-63, 4.08e-63j)
| (-0.95857246461381850711 - 7.6373409087490117051e-152j)  +/-  (2.02e-63, 2.02e-63j)
| (-2.0201828704560856329 - 5.299469827377980908e-169j)  +/-  (4.08e-63, 4.08e-63j)
| (-3.0123998313786051472e-182 - 1.5061999156893025736e-182j)  +/-  (1.68e-181, 1.68e-181j)
| (0.95857246461381850711 + 6.4955023677599683308e-200j)  +/-  (1.1e-63, 1.1e-63j)
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The weights are:
| (0.011257411327720688933 + 7.8222406050184546634e-138j)  +/-  (1.69e-29, 1.3e-61j)
| (0.2220759220056126444 - 5.7734727766650247506e-138j)  +/-  (1.26e-28, 9.72e-61j)
| (0.011257411327720688933 + 9.5834042049202468584e-139j)  +/-  (9.02e-30, 6.97e-62j)
| (0.53333333333333333333 + 1.3192584916113010174e-137j)  +/-  (6.95e-29, 5.48e-61j)
| (0.2220759220056126444 - 1.6199693164958464773e-137j)  +/-  (2.99e-29, 2.15e-61j)
