Example of a Curve with gcd(a3,a4) ¹ 1
E : y2 + xy = x3 + x2 -7x +5
P = (2,1,1)
Substitute y = y+1 and x = x+2 to get
E : y2 + xy +4y = x3 +7x2 +8x
P = (0,0,1)
gcd(a3,a4) = 4
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