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May 13, 2014 at 3:10 vote accept XL _At_Here_There
Apr 29, 2014 at 9:46 comment added XL _At_Here_There It jumps from p of $ax+by=c$ to NPC of $ax^2+by=c$
Apr 29, 2014 at 5:35 comment added Gerry Myerson @Bjørn, I wouldn't call it a Pell equation. It's in reference to the second paragraph of the question XL posted, which was about "computable Diophantine equations" generally.
Apr 29, 2014 at 5:16 comment added Bjørn Kjos-Hanssen Is that a Pell equation or just a simple Diophantine equation?
Apr 29, 2014 at 5:13 comment added Gerry Myerson @Bjørn, no --- what I wrote is what it says in Garey and Johnson.
Apr 29, 2014 at 3:03 history answered Gerry Myerson CC BY-SA 3.0