| list l=1,"str";
l[1];
→ 1
l[2];
→ str
ring r;
listvar(r);
→ // r [0] *ring
ideal i = x^2, y^2 + z^3;
l[3] = i;
l;
→ [1]:
→ 1
→ [2]:
→ str
→ [3]:
→ _[1]=x2
→ _[2]=z3+y2
listvar(r); // the list l belongs now to the ring r
→ // r [0] *ring
→ // l [0] list, size: 3
→ // i [0] ideal, 2 generator(s)
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