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## Comments

\(m+n\). Since \(n=s^n(0)\) and \(m=s^m(0)\), concatenation gives \(s^{n}(s^m(0))=s^{(n+m)}(0)=n+m\). So, concatenation corresponds to summation, and is commutative (since there is only one symbol/function being concatenated).

`\\(m+n\\). Since \\(n=s^n(0)\\) and \\(m=s^m(0)\\), concatenation gives \\(s^{n}(s^m(0))=s^{(n+m)}(0)=n+m\\). So, concatenation corresponds to summation, and is commutative (since there is only one symbol/function being concatenated).`