Thank you, and i already tried this. In this case it obiously does work but in case i have denominators, can u explain me how to solve it? for example: K(s/(s+t),s^2*t^2) then i have to calculate the elimination ideal of ((a0-s,a1-s^2t^2):(s+t)^\inf) where (I:J^\inf) is the saturation of I with respect to J?
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