Starting with polynomial:
P : 4*t^2 - 2
Extension levels are: 2 19
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Trying to find an order 19 Kronrod extension for:
P1 : 4*t^2 - 2
Solvable: 1
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Ending with final polynomial:
P : 4*t^21 - 2152732306/5691719*t^19 + 81863797518/5691719*t^17 - 95597718606/334807*t^15 + 2153647313685/669614*t^13 - 28046530417815/1339228*t^11 + 2343350285640/30437*t^9 - 36312417999585/243496*t^7 + 256397116293045/1947968*t^5 - 146126492878275/3895936*t^3 + 1105095147975/3895936*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
  current precision for roots: 212
  current precision for roots: 424
 current precision for weights: 212
Linear system for weights solvable: 1
Sufficient bits for target precision reached
Positive weights:   20 out of 21
Indefinite weights: 0 out of 21
Negative weights:   1 out of 21
Extension rule has valid weights: 0
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*** EXTENSION WITH INVALID WEIGHTS ***
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