Starting with polynomial:
P : 2*t
Extension levels are: 1 6
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Trying to find an order 6 Kronrod extension for:
P1 : 2*t
Solvable: 1
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Ending with final polynomial:
P : 2*t^7 - 21*t^5 + 105/2*t^3 - 105/4*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:
| (-2.6519613568352334924 - 1.3120851772591970218e-141j)  +/-  (1.08e-62, 1.08e-62j)
| (-1.673551628767471445 + 0j)  +/-  (1.02e-62, 1.02e-62j)
| (0.81628788285896466304 - 2.276104959472719343e-159j)  +/-  (4.84e-63, 4.84e-63j)
| (6.4690793791235118506e-173 - 6.4690793791235118506e-173j)  +/-  (6.4e-172, 6.4e-172j)
| (2.6519613568352334924 - 5.8835934206613381781e-185j)  +/-  (1.08e-62, 1.08e-62j)
| (1.673551628767471445 + 0j)  +/-  (1.52e-62, 1.52e-62j)
| (-0.81628788285896466304 + 0j)  +/-  (4.84e-63, 4.84e-63j)
-------------------------------------------------
The weights are:
| (0.00054826885597221779162 - 1.9077558654806389246e-144j)  +/-  (5.8e-29, 1.61e-60j)
| (0.03075712396758649704 + 5.5069472575335120217e-144j)  +/-  (7.47e-28, 2.08e-59j)
| (0.24012317860501271374 - 4.3407578541940789901e-144j)  +/-  (1.9e-27, 5.2e-59j)
| (0.45714285714285714286 + 7.8328100604353257246e-144j)  +/-  (1.27e-27, 3.56e-59j)
| (0.00054826885597221779162 - 1.3563082984219733006e-145j)  +/-  (5.02e-30, 1.4e-61j)
| (0.03075712396758649704 + 1.2456443401420320875e-144j)  +/-  (6.27e-29, 1.77e-60j)
| (0.24012317860501271374 - 8.2012571085939545891e-144j)  +/-  (2.4e-28, 5.13e-60j)
