(July 7, 2022, updated March 26, 2025) Perhaps everyone has heard of the time-space continuum from Einstein's Relativity Theory. This is the foundation of the universe and mathematics because it has the property that some smaller interval always exists. If a system needs it then it can pop into existence. The classic example of a continuum is the mathematical curve defined by 1/x shown to the left. Because the curve is symmetric around the point (1,1) as many points can exist between 0 and 1 as between 1 and infinity.
With no hard minimum length, lengths can only be defined in a relative fashion by ratios from geometry or from wave functions (musical harmonics, quantum mechanics). That is, by comparison of a reference length to another. The reference length can be called 1. All other numbers can then be defined by a ratio making process. Mathematics can thus be used to approximately describe the workings of continuums.
Historically, this insight was first made by the Pythagoreans. The first Pythagorean who wrote anything down seems to be the Greek Philolaus who began his book (only now exists in small fragments) with a bold statement about this insight:
- Nature (physis) in the world-order (cosmos) was fitted together out of things which are unlimited and out of things which are limiting, both the world-order as a whole and everything in it. (Fr. 1)
Here the continuum is called an "unlimited" and the "limiting" processes were the ratios defined from geometry and musical harmonics.
Stanford Encyclopedia of Philosophy - Philolaus (Sept 2003, revised September 2024). Online at: https://plato.stanford.edu/entries/philolaus/