(NONCOMMIFY)
(OFF PBSERIES)
(SETQ ALGOUTMODE 'MACAULAY)
(ALGFORMINPUT)
setinvars y,x,a,b;
x^2-y^2, x*y^2-y^2*x;
(GROEBNERINIT)
(INPOLS2GBASIS)
(BIGOUTPUT)
(ALGFORMINPUT)
x*a-y*b;
(GROEBNERKERNEL)
%(GROEBNERFINISH)
%(BIGOUTPUT)
(INTERPBACKTRACE)
