2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/50913We show that relativistic strings of open and closed types in Minkowski space-time of dimension 3 and 4 have topologically stable singular points. This paper describes the structure of singularities, derives their normal forms, and introduces a local characteristic of singularity (topological charge), possessing a global law of conservation. Two other types of solutions (breaking and exotic strings) are also considered, which have singularities at arbitrary value of dimension.10 pages, 21 figuresHigh Energy Physics - Theorytext