## SelfNonCommuting

Make tensor components non-commuting.

Used to make objects with indices non-commuting when their index
values are different. See `SelfAntiCommuting`

for more
information.A_{m}::SelfNonCommuting.
ex:= A_{n} A_{a} A_{m};
sort_product(_);

\(\displaystyle{}A_{n} A_{a} A_{m}\)

\(\displaystyle{}A_{n} A_{a} A_{m}\)