Indexing and merging in APL
John A. Gerth, Donald L. Orth · ACM SIGAPL APL Quote Quad · 1987
Mathematically, an array may be usefully viewed as a function, in this particular case, as a function of its indices. A proposal is made for an operator which derives such a function for its array operand. The proposal is discussed in the context of a review of indexing constructs in various APL systems.