A Finitist's Manifesto: Do we need to Reformulate the Foundations of Mathematics?

• URL: http://arxiv.org/abs/2009.06485v1
• Date: Mon, 14 Sep 2020 14:44:08 GMT
• Title: A Finitist's Manifesto: Do we need to Reformulate the Foundations of Mathematics?
• Authors: Jonathan Lenchner
• Abstract summary: This essay is a call for practicing mathematicians who have been sleep-walking in their infinitary paradise take heed. Much of mathematics relies upon (i) the "existence" of objects that contain an infinite number of elements, (ii) our ability, "in theory", to compute with an arbitrary level of precision, or (iii) our ability, "in theory", to compute for an arbitrarily large number of time steps.
• Score: 1.384477926572109
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: There is a problem with the foundations of classical mathematics, and potentially even with the foundations of computer science, that mathematicians have by-and-large ignored. This essay is a call for practicing mathematicians who have been sleep-walking in their infinitary mathematical paradise to take heed. Much of mathematics relies upon either (i) the "existence'" of objects that contain an infinite number of elements, (ii) our ability, "in theory", to compute with an arbitrary level of precision, or (iii) our ability, "in theory", to compute for an arbitrarily large number of time steps. All of calculus relies on the notion of a limit. The monumental results of real and complex analysis rely on a seamless notion of the "continuum" of real numbers, which extends in the plane to the complex numbers and gives us, among other things, "rigorous" definitions of continuity, the derivative, various different integrals, as well as the fundamental theorems of calculus and of algebra -- the former of which says that the derivative and integral can be viewed as inverse operations, and the latter of which says that every polynomial over $\mathbb{C}$ has a complex root. This essay is an inquiry into whether there is any way to assign meaning to the notions of "existence" and "in theory'" in (i) to (iii) above.

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