Why Space is Three-Dimensional and Time One-Dimensional: Algebra Instead of Postulate
Why do we live in three spatial dimensions and one temporal dimension?
The standard physicist's answer: "Because that's how the world is structured." The standard philosopher's answer: "It is a transcendental condition for the possibility of experience" (Kant, 1781; translation: "I don't know, but it sounds authoritative"). The standard string theory answer: "There are actually ten, it's just that six are compactified." Why exactly six are compactified — a separate question, which also has no answer.
In UHM the answer is a theorem. The seven dimensions of a holon decompose into three classes, and this partition dictates 3+1. Not because "it is convenient," but because the algebra leaves no alternatives.
Below — how this works, where time comes from, and why it does not exist at all as a "flow."