𝐸 = 𝑀𝑐² and 𝐸 = 𝑀𝑐∞

Introduction

Directional physics is built on three foundational principles:

• mass is composed of confined strings,
• light is a liberated string,
• energy is directional tension.

In this framework, the speed of light is not a geometric parameter but a maximum directional intensity. The classical expression “squared” has no physical meaning in a multidimensional directional space.

2. Einstein’s Conceptual Error: The Photon Without Mass

Einstein assumed that:

the photon has no rest mass.

This assumption is compatible with classical physics but incorrect in directional physics.

In a directional model:

• a photon is a liberated string,
• every string carries directional tension,
• directional tension corresponds to directional mass,
• this mass is infinitesimal but non‑zero,
• it cannot be measured at rest because a photon cannot be immobilized.

Einstein’s error was therefore ontological, not mathematical: he concluded that the photon had no mass simply because it could not be stopped.

In directional physics:

a photon possesses a directional mass equal to that of a single confined string that has been liberated.