ISETL is a programming language created in 1989 by Jacob T. Schwartz.
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SETL (SET Language) is a very highlevel programming language based on the mathematical theory of sets. It was originally developed by (Jack) Jacob T. Schwartz at the New York University (NYU) Courant Institute of Mathematical Sciences in the late 1960s.. Read more on Wikipedia...
procedure factorial(n);  calculates the factorial n!
return if n = 1 then 1 else n * factorial(n  1) end if;
end factorial;
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