Why Relativity Applies to Light Too

The principle of relativity is often seen as applying seamlessly to mechanics but trickier for electromagnetism (thanks to historical ether ideas). But what if it's nearly tautological even for light, once you enforce strict locality?

PhysicsV.com (2025). Closing the Electromagnetic Loophole in the Near-Tautological Derivation of the Principle of Relativity: The Role of Strict Locality. Zenodo. https://doi.org/10.5281/zenodo.18015183

-- Me@2025-12-22 10:47:28 PM

Is the Principle of Relativity a Tautology? (Yes, Almost – With a Key Assumption About Locality)

The principle of relativity often gets treated as a postulate (Einstein's assumption) or experimental fact (e.g., Michelson-Morley), but what if it's nearly tautological? Here's the gist from my note: This note presents a conceptual argument demonstrating why the principle of relativity can be

Why the Speed of Light Is Invariant

Why Every Observer Always Measures the Same Speed of Light In any local inertial frame, the speed of light is always measured to be exactly \(c=1\) (in natural units), or \(299\,792\,458\,\mathrm{m\,s}^{-1}\), because every method of measuring it, directly or indirectly, uses light (or

Mario's Moral Ambiguity in Animal Killing

The Paradox of Living for Others

A Philosophical Puzzle What does it mean to live for other people? It’s a question that sounds noble at first—selflessness is often praised as a virtue. But a curious quotation got me thinking: “I live for other people; but what other people live for, I have no idea.

Read more

Is the Principle of Relativity a Tautology? (Yes, Almost – With a Key Assumption About Locality)

Why the Speed of Light Is Invariant

Mario's Moral Ambiguity in Animal Killing

The Paradox of Living for Others