BRT Readers Guide

This document is a self-contained guide to Boundary Relativity Theory (BRT) and its Foundational Reference, the BRT Canon v1.0. It is designed to help readers grasp the overall structure of BRT without first reading the full Canon, and to provide a navigational map into the Canon for topic-specific study. The guide explains the derivation of P² = P from five principles, the emergence of the Klein four-group V₄ as the minimal observation symmetry, the resulting structure sequence, the Grassmannian framework Gr(4,15), the derivation of the gauge-group structure, the main dimensionless predictions, the separation equation, cosmological and gravitational consequences, and the theory’s rejection conditions. It also provides multiple reading paths tailored to different audiences, including particle physicists, cosmologists, gravity theorists, mathematicians, and philosophers of science. This guide accompanies the BRT Canon v1.0 (Freeze Date: April 1, 2026). Keywords Boundary Relativity Theory BRT BRT Canon reader’s guide foundational reference idempotency P2=PP^2 = PP2=P Klein four-group V4 Grassmannian geometry Gr(4,15) physical constants cosmology gravity zero free parameters