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Set theory is the standard foundation for mathematics, butoften lacks rules of reduction for function calls. Thus, forcomputer science, the untyped lambda calculus or type theory isusually preferred. The untyped lambda calculus and severalimprovements make functions fundamental, but suffer fromnon-terminating reductions and have partially non-classical logics.Type theory is a good foundation for logic, math and computerscience, yet with both types and functions fundamental, it is morecomplex than set theory or the untyped lambda calculus.NummSquared, a new foundational language, makes only functionsfundamental, yet ensures terminating reductions, has a classicallogic, and attempts to follow set theory as much as possible.NummSquared builds on John von Neumann\'s 1925 work and R. B.Jones\'s 1998 work. NummSquared is well-founded, has reduction andproof, and supports computation and reflection. Because ofcoercion, there are no types, and functions are defined and calledwithout proof, yet reduction terminates. An interpreter, NsGo (inprogress when Samuel Howse died), is an F/C .NET assembly, mostlyautomatically extracted from a program of the Coq proofassistant.
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