2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/221274The paper considers, within the Standard Model, physical pictures of combinations and interactions of elementary particles, which are allowed within the isotopic Foldy-Wouthuysen representation. A hypothesis is suggested and proved that the properties of the world of dark matter do not contradict the two physical pictures considered in the paper.12 pages, 4 figuresGeneral Physicstext