The article discusses ten influential but mostly dead programming languages, highlighting their historical significance and impact on modern computing. It emphasizes the importance of understanding how these languages influenced contemporary programming through citations and shared syntax, while also examining the reasons for their decline.

SETL is a high-level programming language developed in the late 1960s at New York University's Courant Institute, based on set theory. It features aggregate data types such as sets and tuples, and supports operations like union and intersection, along with quantified boolean expressions. Variants of SETL include SETL2 and ISETL, with influences on languages like Ada and Python's ABC.