2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/35336The Campbell-Magaard theorem is widely seen as a way of embedding Einstein's 4D theory of general relativity in a 5D theory of the Kaluza-Klein type. We give a brief history of theorem, present a short account of it, and show that it provides a geometrical frame for new physics related to the unification of the forces. Anderson's recent vituperative attack on Campbell's theorem (gr-qc/0409122)is errant.General Relativity and Quantum Cosmologytext