## expand_power

Expand powers into repeated products

Expand powers into repeated products, i.e. do the opposite
of `collect_factors`

. For example,ex:=(A B)**3;

\(\displaystyle{}\left(A B\right)^{3}\)

expand_power(_);

\(\displaystyle{}A B A B A B\)

sort_product(_);

\(\displaystyle{}A A A B B B\)

collect_factors(_);

\(\displaystyle{}A^{3} B^{3}\)

This command automatically takes care of index relabelling when
necessary, as in the following example

{m,n,p,q,r}::Indices(vector).
ex:= (A_m B_m)**3;

\(\displaystyle{}\left(A_{m} B_{m}\right)^{3}\)

expand_power(_);

\(\displaystyle{}A_{m} B_{m} A_{n} B_{n} A_{p} B_{p}\)