Jeroen Demeyer on Tue, 11 Feb 2014 11:34:00 +0100

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Component [5] of prime ideal structure


gp> idealprimedec(nfinit(x^2+1), 5)[1][5]
%4 =
[2 -1]

[1  2]

What is the meaning of this? The documentation ??idealprimedec says that it is supposed to be an algebraic integer, but I don't understand it. This changed from PARI-2.5 to PARI-2.6 and it breaks Denis Simon's GP scripts.