An operator calculus
Kenneth E. Iverson, Roland Pesch, J. Henri Schueler · 1984
This paper extends a line of APL development presented in a sequence of papers [1-7] over the past six years. The main topics addressed are the interactions of operators such as rank, composition, derivative, and inverse (i.e., the beginnings of a calculus of operators), a simplification in the complement of attributes tentatively presented in [6], and a treatment of the shapes of individual results (as defined in [7]) in the case of empty frames.