Prof. J. E. Cremona on Tue, 30 May 2000 17:05:17 +0100 (BST)


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bug in ellap 

e=ellinit([1, -1, 0, -79, 289]);
(17:00) gp > ellap(e,2)
%39 = 1
(17:00) gp > ellap(e,2,0)
%40 = 1
(17:00) gp > ellap(e,2,1)
%41 = -1
(17:00) gp > ellak(e,2)  
%42 = -1

The default option on ellap gives the wrong answer here (-1 is the
right answer!).

Secondly, the manual entry for ellap should stress that it gives wrong
answers for non-minimal models (as the entry for ellak does, repeated
in ellan).

John Cremona and Tom Womack