Quick way to get the repelling fixed point from the attracting fixed point? JmsNxn Ultimate Fellow Posts: 1,176 Threads: 123 Joined: Dec 2010 07/22/2022, 01:51 AM (07/21/2022, 06:52 AM)Gottfried Wrote: (07/21/2022, 06:09 AM)JmsNxn Wrote: I want that in PARI-GP, and everything I've read says that pari doesn't support complex Lambert W, and additionally only has the principal branch. Thank you though, I want $$W_{-1}$$ not $$W_1$$, I knew I was screwing something up. You answered my question, but I'm still confused how to run this in Pari-GP. That's still confusing me. How do I write Code:LambertW(sqrt(2) + O(y),-1) = 4 + O(y)\\ Hi James - two ways: either use Mike3's implementation (I'd attached the Pari/GP-code to my earlier answer) or download the latest Pari/GP version 2.14 (which firms as "development version" at the "bleeding edge" ;-) )from the Pari-group's website.    With Mike3's implementation he didn't call it "LambertW()" but simply "lambw()" or so; I renamed it in the downloaded Pari/GP-source simply for my own convenience. Gottfried GREAT! I'll get the pari development version! Didn't know that was a thing, lol. « Next Oldest | Next Newest »

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