Temporal Justification Of M. Heidegger’S Ontological Differentiation: Simultaneity[Темпоральное Обоснование Онтологической Дифференции М. Хайдеггера: Одновременность]

Introduction. The article considers the ontological difference as a fundamental idea dividing M. Heidegger’s ontology into two levels. The author proposes an explication of temporal foundations for the main principle of fundamental ontology, the ontological difference, on the basis of existential analytics of Dasein. It is assumed that the organization of Dasein is a micromodel of being in general, which is the ultimate goal of M. Heidegger’s philosophical work. The aim of the study is to explicate the phenomenon of simultaneity as the ontological basis of the temporality of Dasein as a result of philosophical analysis, Methods The author uses hermeneutic, phenomenological and some general scientific methods such as analysis, synthesis, and abstraction. The scientific novelty of the study. When analyzing the self as an existential center of Dasein the author reveals the ontological duality of the first and, as a consequence, of the entire model of existence. The phenomenon of existence towards death is analyzed in the context of existential gap in the centre of the Dasein self, which gives rise to different ways of Dasein being - genuine and non-genuine; the author considers and analyzes the whole structure of the temporal Dasein in the light of the thesis of the human existence finiteness. On the basis of this idea, the key role of simultaneity is revealed, which becomes the ontologically initial concept in relation to the whole Dasein system of being and, accordingly, the fundamental ontology. It is suggested that the ontological difference is based on the more fundamental principle of temporal synthesis. Results. The author presents a model of Dasein existence structure on the basis of the dual nature of the self, with the simultaneity belonging to the ontologically determining specificity of the organization. Conclusions. The temporal justification of ontological differences reveals a feature of fundamental ontology, which consists in a specifically transformed dialectic of being and nothing. The study shows that fundamental ontology offers an atypical approach to the problem of time.