The ArrayIndFns(A) function returns the sequence of indexing functions for Array A.

This function is equivalent to op(1, A).

$A≔\mathrm{Array}\left(\mathrm{triangular}\left[\mathrm{upper}\right]\,1..3\,1..4\right)$

$A≔\left[\begin{array}{cccc}0& 0& 0& 0\\ 0& 0& 0& 0\\ 0& 0& 0& 0\end{array}\right]$

$\mathrm{ArrayIndFns}\left(A\right)$

${\mathrm{triangular}}_{\mathrm{upper}}$

$\mathrm{op}\left(1\,A\right)$

${\mathrm{triangular}}_{\mathrm{upper}}$