2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/117707If we assume that there is the ultimate thoery at all, how should the concept of the spacetime be formulated? The following essay is my consideration on such a question. The use of mathematical expressions is suppressed as long as possible. Any criticism on my opinion is welcome.14pagesHigh Energy Physics - Theorytext