Registry · Theorem II.T18 established formalized

II.T18 — Parallel Postulate

The parallel postulate holds in tau^3: for any line l and point p not on l, there exists a unique parallel through p, constructed via CRT product of prime-order affine spaces.

Book II Part 4 Ch. 20

Dependency Graph

Depends on (3)

II.D10 II.D14 II.T15

Depended on by (2)

II.D71 II.T45

Lean Formalization

Module: TauLib.BookII.Geometry.PaschParallel

Symbol: parallel_unique_check