Assignment Operator

S[i] := x: List, RngIntElt, Elt

Redefine the \(i\)-th term of the list \(S\) to be \(x\). If \(i \leq 0\), then an error results. If \(i = \#S + 1\), then \(x\) is appended to \(S\). Otherwise, if \(i > \#S + 1\), an error results. Here \(i\) is allowed to be a multi-index.