bash-2.05a$ mwrank3 Program mwrank: uses 2-descent (via 2-isogeny if possible) to determine the rank of an elliptic curve E over Q, and list a set of points which generate E(Q) modulo 2E(Q). and finally search for further points on the curve. For more details see the file mwrank.doc. For details of algorithms see the author's book. Please acknowledge use of this program in published work, and send problems to John.Cremona@nottingham.ac.uk. Version compiled on Feb 11 2003 at 17:40:15 by GCC 3.2.1 using base arithmetic option LiDIA_ALL (LiDIA bigints and multiprecision floating point) Using LiDIA multiprecision floating point with 15 decimal places. Enter curve: [0,0,0,-6,-14] Curve [0,0,0,-6,-14] : No points of order 2 Basic pair: I=18, J=378 disc=-119556 2-adic index bound = 2 2-adic index = 2 Two (I,J) pairs Looking for quartics with I = 18, J = 378 Looking for Type 3 quartics: Trying negative a from -1 down to -2 (-1,-1,-3,3,0) --trivial Finished looking for Type 3 quartics. Looking for quartics with I = 288, J = 24192 Looking for Type 3 quartics: Trying positive a from 1 up to 3 (square a first...) (1,0,-30,72,-51) --nontrivial...(x:y:z) = (1 : 1 : 0) Point = [5 : 9 : 1] height = 1.36236268153397 Doubling global 2-adic index to 2 global 2-adic index is equal to local index so we abort the search for large quartics Rank of B=im(eps) increases to 1 Exiting search for large quartics after finding enough globally soluble ones. Mordell rank contribution from B=im(eps) = 1 Selmer rank contribution from B=im(eps) = 1 Sha rank contribution from B=im(eps) = 0 Mordell rank contribution from A=ker(eps) = 0 Selmer rank contribution from A=ker(eps) = 0 Sha rank contribution from A=ker(eps) = 0 Rank = 1 Points generating E(Q)/2E(Q): Point [5 : 9 : 1], height = 1.36236268153397 After descent, rank of points found is 1 Generator 1 is [5 : 9 : 1]; height 1.36236268153397 The rank has been determined unconditionally. The basis given is for a subgroup of full rank of the Mordell-Weil group (modulo torsion), possibly of index greater than 1. Regulator (of this subgroup) = 1.36236268153397 (1.9 seconds) Enter curve: [0,0,0,0,0] bash-2.05a$