Published 18 min read August 16, 2026

The Postulates of Kinematics

Plain language summary

This part establishes the two foundational postulates of the theory — the same postulates Einstein adopted in 1905, but interpreted with greater precision. The conclusions that follow from this interpretation diverge from Special Relativity at a fundamental level.

Prerequisites: Basic algebra, familiarity with the concept of inertial reference frames

Postulate I — The Principle of Relativity: The laws of physics are identical in all inertial reference frames. No experiment conducted within a closed inertial system can distinguish that system's state of rest from uniform motion.

Postulate II — The Invariance

📖

Read the abstract and philosophy

Create a free account to access the abstract and philosophical context. No credit card required.