On the Unification Problem in Physics

Understand

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.