Solving the diophantine equation ax2 + bxy + cy2 + dx + ey +f = 0, where not all of a, b and c are zero.
See the note for an outline of the algorithm used. A novel feature is the use of a theorem of John Robertson in the case
b2 - 4ac > 0 and nonsquare and where not both d and e are zero.
The output should be equivalent to that of the Sawilla, Silvester, Williams program.
This is a BCMath version of BC function sswgeneral(a,b,c,d,e,f) contained in patz.
Last modified 7th May 2015
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