Inspired by Ken Iverson’s paper “Notation as a Tool of Thought”, this podcast explores various aspects of notation, in the context of the APL programming language.

Richard YouTube is the media manager and an APL instructor at Dyalog Ltd, has taught APL at multiple schools, and created an online self-study course.

Adám YouTube is head of language design at Dyalog Ltd, launched the APL Orchard chat room and the APLcart code phrase search, and is the co-author of the APL Cultivations book.

Both are regular presenters at various APL events, and recurring panellists on the Array Cast podcast.

Send feedback to

2 June 2023

Terminology, Files, and Array Theory


Together with out first guest, Silas Poulson, we begin by discussing terminology, but then we go on a wild ride, mentioning the history of file operations, review of various primitives, APL’s array model, comparison of ways to apply functions, glyphs, syntax, and much more.

Video (YouTube) ∙ Audio (download)

tags: terminology, files, history