# On the Unification Problem in Physics

## TL;DR

This paper revisits Kaluza's 1921 unification approach, translating and formatting his original work on 5-dimensional spacetime to clarify its historical and scientific significance in unifying gravity and electromagnetism.

## Contribution

It provides a revised, accurately formatted translation of Kaluza's original paper, restoring original notation and offering clearer insight into early unification theories.

## Key findings

- Restores Kaluza's original notation and formatting.
- Clarifies historical context of unification approach.
- Highlights the foundational role of 5D spacetime in physics.

## Abstract

Revised translation of Kaluza's historic 1921 paper, "Zum Unit\"atsproblem der Physik," on 5-dimensional spacetime, used to unify gravity and electromagnetism. This version is based, in part, on a 1984 translation provided by T. Muta, but revised and formatted using LaTeX to closely match the original paper in appearance and pagination. Kaluza's original notation is restored.