Starting with polynomial:
P : 3/2*t^2 - 1/2
Extension levels are: 2 6 7
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Trying to find an order 6 Kronrod extension for:
P1 : 3/2*t^2 - 1/2
Solvable: 1
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Trying to find an order 7 Kronrod extension for:
P2 : 3/2*t^8 - 161/52*t^6 + 105/52*t^4 - 245/572*t^2 + 25/1716
Solvable: 1
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Ending with final polynomial:
P : 3/2*t^15 - 52675/9724*t^13 + 62424565/7972932*t^11 - 25786918405/4472814852*t^9 + 30491079041/13418444556*t^7 - 701814715/1530173502*t^5 + 12997042835/319806261918*t^3 - 1504480675/1439128178631*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:
| (0.98219129046748981137 - 6.4772579184213586041e-161j)  +/-  (7.65e-60, 7.65e-60j)
| (-0.57735026918962576451 + 5.8351095999694076892e-170j)  +/-  (7.65e-61, 7.65e-61j)
| (-0.98219129046748981137 - 1.5040609556462165053e-170j)  +/-  (6.81e-60, 6.81e-60j)
| (0.7447028913802697073 + 5.2324180111113819964e-177j)  +/-  (6.62e-60, 6.62e-60j)
| (0.91559222384640657431 + 2.9951688460817549891e-187j)  +/-  (2.37e-59, 2.37e-59j)
| (0.57735026918962576451 - 5.9375772794426855784e-193j)  +/-  (8.18e-61, 8.18e-61j)
| (-0.2041968861768067152 + 8.1396100848643175522e-201j)  +/-  (6.42e-63, 6.42e-63j)
| (-0.7447028913802697073 + 4.8419197796359025038e-198j)  +/-  (6.5e-60, 6.5e-60j)
| (-0.39286837471435555757 - 1.5411675521185102826e-200j)  +/-  (7.11e-62, 7.11e-62j)
| (0.39286837471435555757 + 3.2856467442251048356e-198j)  +/-  (7.26e-62, 7.26e-62j)
| (0.85110112875893547946 + 4.3964673979606926801e-204j)  +/-  (2.12e-59, 2.12e-59j)
| (0.2041968861768067152 + 6.8506131637003317859e-212j)  +/-  (6.13e-63, 6.13e-63j)
| (-0.91559222384640657431 + 1.7317988053561560282e-213j)  +/-  (2.04e-59, 2.04e-59j)
| (-0.85110112875893547946 - 7.0925428460566189094e-214j)  +/-  (2.02e-59, 2.02e-59j)
| (2.5454831686767620012e-214 - 4.3367491021900389651e-214j)  +/-  (7.54e-213, 7.54e-213j)
-------------------------------------------------
The weights are:
| (0.044964512680917677187 + 1.0979023098930083496e-160j)  +/-  (2.55e-18, 1.07e-46j)
| (0.18118099815635901906 + 2.2082161703660818544e-161j)  +/-  (8.91e-19, 3.73e-47j)
| (0.044964512680917677187 + 1.4826375635543220444e-162j)  +/-  (5.23e-19, 2.19e-47j)
| (0.14641681907094821752 - 1.3985803920086087814e-160j)  +/-  (4.71e-19, 1.97e-47j)
| (0.077315723559711686555 - 2.6335316950765977617e-160j)  +/-  (2.64e-19, 1.11e-47j)
| (0.18118099815635901906 + 8.506561122627629966e-161j)  +/-  (2.6e-19, 1.09e-47j)
| (0.19580798780630712095 + 3.9505305382477487177e-161j)  +/-  (3.99e-20, 1.67e-48j)
| (0.14641681907094821752 - 1.9233756194418470476e-161j)  +/-  (9.29e-21, 3.88e-49j)
| (0.18515371484542379282 - 3.054567701385579071e-161j)  +/-  (2.7e-20, 1.13e-48j)
| (0.18515371484542379282 - 7.1271839623016357148e-161j)  +/-  (2.08e-20, 8.69e-49j)
| (0.064615333728258519637 + 2.4603478174697568536e-160j)  +/-  (3.66e-20, 1.53e-48j)
| (0.19580798780630712095 + 6.0242884704629461637e-161j)  +/-  (8.58e-21, 3.59e-49j)
| (0.077315723559711686555 - 9.2418734814934719451e-162j)  +/-  (3.54e-22, 1.47e-50j)
| (0.064615333728258519637 + 1.7592795789408520948e-161j)  +/-  (5.83e-22, 2.42e-50j)
| (0.20908982030414793252 - 4.8292054084978685742e-161j)  +/-  (1.01e-21, 4.32e-50j)
