Starting with polynomial:
P : 3/2*t^2 - 1/2
Extension levels are: 2 4 9
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Trying to find an order 4 Kronrod extension for:
P1 : 3/2*t^2 - 1/2
Solvable: 1
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Trying to find an order 9 Kronrod extension for:
P2 : 3/2*t^6 - 25/14*t^4 + 45/98*t^2 - 1/98
Solvable: 1
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Ending with final polynomial:
P : 3/2*t^15 - 1280116003/245021714*t^13 + 12427268373/1715151998*t^11 - 61055366515/12006063986*t^9 + 7331508745275/3877958667478*t^7 - 195050681397/553994095354*t^5 + 14996878941/553994095354*t^3 - 264841293/553994095354*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:
| (0.98280708179129512709 + 3.1334323886047323407e-133j)  +/-  (4.14e-60, 4.14e-60j)
| (-0.98280708179129512709 - 9.6984108463621701741e-141j)  +/-  (4.14e-60, 4.14e-60j)
| (-0.91248695683407599658 - 2.7287271420812363063e-140j)  +/-  (9.21e-60, 9.21e-60j)
| (0.57735026918962576451 - 3.4484121671183537651e-147j)  +/-  (7e-61, 7e-61j)
| (0.72770080257399915914 - 1.2453754094338255134e-166j)  +/-  (5.36e-60, 5.36e-60j)
| (0.81106721229304993576 + 8.2738032478050068129e-184j)  +/-  (1.26e-59, 1.26e-59j)
| (-0.15655801081562154215 + 1.4766440518651991326e-185j)  +/-  (2.8e-63, 2.8e-63j)
| (-0.81106721229304993576 - 4.990137583832394734e-185j)  +/-  (1.37e-59, 1.37e-59j)
| (-0.37314303819498557267 - 1.2478935020018402203e-187j)  +/-  (4.23e-62, 4.23e-62j)
| (0.37314303819498557267 + 7.3544917758266727226e-185j)  +/-  (4.77e-62, 4.77e-62j)
| (0.91248695683407599658 - 8.5633863614781820514e-184j)  +/-  (9.96e-60, 9.96e-60j)
| (0.15655801081562154215 + 4.9973253157391589306e-191j)  +/-  (2.8e-63, 2.8e-63j)
| (-0.57735026918962576451 - 1.8001090454258466371e-193j)  +/-  (7.95e-61, 7.95e-61j)
| (-0.72770080257399915914 - 2.98154565507299326e-191j)  +/-  (5.45e-60, 5.45e-60j)
| (-1.8137222363044535154e-191 - 3.3973044909630247116e-192j)  +/-  (2.77e-190, 2.77e-190j)
-------------------------------------------------
The weights are:
| (0.043826807077955464095 - 4.7697338781644599574e-133j)  +/-  (2.92e-17, 1.28e-45j)
| (0.043826807077955464095 - 6.9865575851936595538e-135j)  +/-  (1.15e-17, 5.03e-46j)
| (0.094029281016713407011 + 3.7529031161332718698e-134j)  +/-  (1.07e-17, 4.67e-46j)
| (0.18573308623764799932 - 7.1814790289947209959e-133j)  +/-  (3.6e-18, 1.57e-46j)
| (0.10405151528975239987 + 1.319817490190665083e-132j)  +/-  (2.07e-18, 9.02e-47j)
| (0.091909535744457170243 - 1.4065750399502382185e-132j)  +/-  (1.2e-18, 5.22e-47j)
| (0.20355035477740418156 - 4.8596313979079948535e-133j)  +/-  (6.78e-20, 2.96e-48j)
| (0.091909535744457170243 - 1.3466101761886668595e-133j)  +/-  (2.2e-20, 9.51e-49j)
| (0.21723920987817137564 + 2.3985739796107742661e-133j)  +/-  (2.55e-20, 1.12e-48j)
| (0.21723920987817137564 + 5.3346540119963376855e-133j)  +/-  (2.29e-20, 1.01e-48j)
| (0.094029281016713407011 + 1.0114963922144824332e-132j)  +/-  (1.16e-20, 5.02e-49j)
| (0.20355035477740418156 - 6.7012413167460403291e-133j)  +/-  (9.33e-21, 4.08e-49j)
| (0.18573308623764799932 - 1.8663370447920558449e-133j)  +/-  (2.04e-21, 8.61e-50j)
| (0.10405151528975239987 + 1.9683843028643368769e-133j)  +/-  (2.36e-21, 9.77e-50j)
| (0.11932041995579600452 + 7.4706073880120064425e-133j)  +/-  (2.99e-21, 1.42e-49j)
