is largely responsible for the perceived elegance of the language. A key point in A P L history has to be, of course, the period during which K e n Iverson distilled c o m m o n notation from the studies of algorithms in a variety of fields. W h a t b e c a m e to be k n o w n as Iverson notation is the first recognizable APL-like notation. "A Formal Description of System~360" by Falkoff, I v e r s o n , an d S u s s e n g u t h in t h e I B M S y s t e m s J o u r n a l (Vo]. 3, No. 3, 1964) s h o w e d t h a t t h e notat i o n could d e s c r i b e s i g n i f i c a n t s ys t em s . W h i l e t h e r e w e r e e a r l y a t t e m p t s
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