|Bill Allombert on Tue, 03 Nov 2015 22:40:56 +0100|
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|Re: new GP function ellisomat|
On Thu, Aug 06, 2015 at 03:09:27PM +0200, Bill Allombert wrote: > Also I am not sure what is the best way to compute the dual isogenies > (from E_i to E). I managed to do it. Now ellisomat also return the dual isogenies. ? E = ellinit("14a1"); ? [L,M]=ellisomat(E); ? L %5 = [[-675/16,6831/32],[x^3+3/4*x^2+19/2*x-311/12,1/2*x^4+(y+1)*x^3+(y-4)*x^2+(-9*y+23)*x+(55*y+55/2),x+1/3],[1/9*x^3-1/4*x^2-141/16*x+5613/64,-1/18*x^4+(1/27*y-1/3)*x^3+(-1/12*y+87/16)*x^2+(49/16*y-48)*x+(-3601/64*y+16947/512),x-3/4]] L is the dual of L Cheers, Bill.