Abstract
Software technology that can be used to validate the logical correctness of mathematical proofs has attained a high degree of power and sophistication; extremely difficult and complex mathematical theorems have been verified. This paper discusses the prospects of doing something comparable for elementary physics: what it would mean, the challenges that would have to be overcome; and the potential impact, both practical and theoretical.
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- 1.
I do not know to what extent the experts agree on which, if any, kinds of theorems lie outside generalizations (1) and (2). As far as I know, there is essentially universal agreement that (1) and (2) are valid across most subfields in mathematics. Whether set theory is the best foundation for mathematics, or whether it is important for mathematics to have foundations at all, are separate questions.
- 2.
This does not, of course, imply that it required ninety man-years of work.
- 3.
Technically speaking, the operator Until here can be viewed as “syntactic sugar”, or as a temporal modal operator, or, if one performs some “representational tinkering” on the arguments, as a first-order predicate.
- 4.
The “Monty Hall” problem is even trickier, and has tripped up professional mathematicians.
- 5.
You may argue that because of noise, the theory does not correspond to a lower-dimensional manifold, it corresponds to a probability distribution centered on the manifold. That hardly helps, because now the probability distribution of the projection onto the manifold depends strongly on largely arbitrary assumptions about the noise.
- 6.
The Lagrangian for the Standard Model, given in full in [33], is 36 lines long and has something like 170 terms and 1000 symbols. However, Gutierrez does claim that he has printed tee shirts with the whole thing.
- 7.
Large levels of trust are needed in any such enterprise. That is why conspiracy theorists, who are willing to distrust any evidence that runs against their theory, are so crazy and so unanswerable; and why any violation of trust—by scientists, by technologists, by the media—is so damaging, not just to the specific instance, but to the entire scientific/technological enterprise.
- 8.
Hendry [41] similarly argues that molecular structures cannot be calculated from Schrödinger’s equation. Rather, given the structure, it is possible to use quantum mechanics to calculate various physical values.
- 9.
Incidentally, the fact that Hilbert included this problem and spent a great deal of time working on it tells strongly against the common idea that Hilbert was a pure formalist, who viewed the meaning of mathematical symbols as unimportant [12].
- 10.
It has been suggested to me that it will be easier to find a logical formulation of the “many-worlds” interpretation of quantum mechanics or, alternatively, the theory of quantum decoherence than the Copenhagen interpretation. That may be so; but I can’t find that anyone has produced a logical formulation of either of these interpretations either.
- 11.
Slemrod [77] writes, “Historically a canonical interpretation of this ‘6th problem of Hilbert’ has been taken to mean passage from the kinetic Boltzmann equation for a rarefied gas to the continuum Euler equations of compressible gas dynamics as the Knudsen number 𝜖 approaches zero.” I do not know what is the basis for this rather narrow interpretation.
- 12.
I am necessarily relying here on the fact that I have failed to find much later work of this flavor, which is obviously an unreliable argument. However, I do have the following concrete evidence. The International Congress of Logic, Methodology, and Philosophy of Science was in some respects the successor to the Symposium on the Axiomatic Method; it has met 15 times since its inception in 1960. Between 1960 and 1999 there was only one paper [66] that presented an axiomatization of any physical theory (relativistic space-time), though there was a second paper [60] that argued in favor of axiomatizations.
- 13.
In fact, despite its popularity as an philosophical example since Frege, there is little evidence that anyone who was aware of the existence of the planets has ever thought that Phosphorus and Hesperus were two different planets.
- 14.
Hossenfelder [45] argues that the fetishizing of mathematical elegance is responsible for the stagnation of fundamental physics over the last few decades.
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Thanks for useful information and helpful feedback to Scott Aaronson, Alan Bundy, Ken Forbus, Tom LaGatta, Michael Strevens, David Tena Cucala, Peter Winkler, and the anonymous reviewer.
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Davis, E. (2019). Proof Verification Technology and Elementary Physics. In: Fillion, N., Corless, R., Kotsireas, I. (eds) Algorithms and Complexity in Mathematics, Epistemology, and Science. Fields Institute Communications, vol 82. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-9051-1_4
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