The free variables of $T$ are the ones that do not appear as the main variable of a polynomial in $T$.
i1 : R = QQ[a,b,c,d,e,f,g,h, MonomialOrder=>Lex]; |
i2 : F = {a*d - b*c, c*f - d*e, e*h - f*g}; |
i3 : H = {d, f, h}; |
i4 : T = triaSystem(R,F,H) o4 = {a*d - b*c, c*f - d*e, e*h - f*g} / {d, f, h} o4 : TriaSystem |
i5 : freeVariables T o5 = {b, d, f, g, h} o5 : List |
The object freeVariables is a method function.