2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/139024Many different mathematical languages have been invented to describe the ideas of Einstein's special relativity. One of the most powerful languages is the Minkowski space-time algebra of D. Hestenes. We discuss the ideas of special relativity in a complex 4-dimensional algebra of observables, which is algebraically isomorphic to the even subalgebra of Hestenes' space-time algebra.11 pages, 3 figures, PIRT Moscow, July 2007Mathematical Physics11E04, 15A66, 51B20, 83A05text