Starting with polynomial:
P : 2*t
Extension levels are: 1 4 8
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Trying to find an order 4 Kronrod extension for:
P1 : 2*t
Solvable: 1
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Trying to find an order 8 Kronrod extension for:
P2 : 2*t^5 - 10*t^3 + 15/2*t
Solvable: 1
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Ending with final polynomial:
P : 2*t^13 - 170/3*t^11 + 3251/6*t^9 - 2163*t^7 + 29631/8*t^5 - 20895/8*t^3 + 19215/32*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:
| (2.7796084806380178827 + 1.1213094319984763477e-205j)  +/-  (3.86e-61, 3.86e-61j)
| (3.6658316928775966507 + 1.9467177638862436593e-208j)  +/-  (1.95e-61, 1.95e-61j)
| (-0.95857246461381850711 - 2.58548453016141736e-209j)  +/-  (6.96e-62, 6.96e-62j)
| (-3.6658316928775966507 - 1.4258186747213698676e-211j)  +/-  (1.9e-61, 1.9e-61j)
| (1.3117288375389628728 - 4.6413368317752925379e-215j)  +/-  (1.88e-61, 1.88e-61j)
| (2.0201828704560856329 + 2.8328471873628494494e-218j)  +/-  (3.61e-61, 3.61e-61j)
| (-2.7796084806380178827 - 2.2477425192698390407e-222j)  +/-  (4.5e-61, 4.5e-61j)
| (-0.66944416045059213743 + 2.0262102036687250967e-225j)  +/-  (1.75e-62, 1.75e-62j)
| (-2.0201828704560856329 - 6.5957363400674645076e-229j)  +/-  (2.86e-61, 2.86e-61j)
| (2.7676811119362682184e-233 - 6.5417917191220885162e-233j)  +/-  (9.23e-232, 9.23e-232j)
| (0.95857246461381850711 - 1.0305838031355413293e-230j)  +/-  (6.96e-62, 6.96e-62j)
| (0.66944416045059213743 - 7.6488641638965958035e-232j)  +/-  (1.75e-62, 1.75e-62j)
| (-1.3117288375389628728 + 9.5980596089320381108e-239j)  +/-  (1.87e-61, 1.87e-61j)
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The weights are:
| (0.00020005768650733837153 - 8.0700740813846938799e-209j)  +/-  (9.02e-23, 1.47e-53j)
| (8.2874382702028428451e-07 - 8.8585757342644070197e-211j)  +/-  (2.72e-24, 4.44e-55j)
| (-0.016959195300645219993 + 3.0739134313286296236e-207j)  +/-  (4.52e-19, 7.4e-50j)
| (8.2874382702028428451e-07 + 1.2167500809556563929e-211j)  +/-  (1.23e-25, 2.01e-56j)
| (0.071454465120006718056 - 2.5082740952918231997e-207j)  +/-  (4.97e-21, 8.13e-52j)
| (0.0069101518110872609821 + 3.7452175982117156101e-208j)  +/-  (3.67e-22, 5.99e-53j)
| (0.00020005768650733837153 - 4.0340291228275404708e-210j)  +/-  (1.52e-24, 2.49e-55j)
| (0.2518727447625320007 - 3.3775855847640290672e-207j)  +/-  (1.89e-21, 3.14e-52j)
| (0.0069101518110872609821 + 5.9241546311924145192e-209j)  +/-  (9e-24, 1.47e-54j)
| (0.37304189435336976321 + 2.5731683526375855082e-207j)  +/-  (6.91e-22, 1.18e-52j)
| (-0.016959195300645219993 + 6.3084794289698809587e-207j)  +/-  (2.28e-22, 3.9e-53j)
| (0.2518727447625320007 - 5.518510709662029931e-207j)  +/-  (1.93e-22, 3.25e-53j)
| (0.071454465120006718056 - 8.9945517684930424447e-208j)  +/-  (5.17e-23, 7.67e-54j)
