The paper presents the problem of indeterminate statements in the work of three thinkers: the creator of syllogistic Aristotle (384–322), its translator into Latin and interpreter Severin Boethius (480–525), and the creator of an imaginary (no-aristotle) logic of N. A. Vasiliev (1880–1940). The difference of Aristotle’s and N. A. Vasiliev logic based on different interpretations of indeterminate statements. The paper shows that the accidental opinion of N. A. Vasiliev similar to indeterminate statement of modal syllogistic of Aristotle, namely, the statement of the potentially inherent.
The matter of article is conception of V. Solovjev as a systematic whole. The subject of special attention is the principle and character of systems construction.
F. Brentano explores consciousness in order to open the natural laws of thinking. At different levels of consciousness (sensory intuition and conceptual thought) are constituted sensual and intellegibel objects. K. Tvardovsky analyses presentation and statement within the framework of descriptive psychology. Description of presentation exposes a betweenness by an act, maintenance and object. Mechanism of constituting of object as unit consists of selection of material and formal parts.
In the paper, a binary semantic for some philosophical logics is suggested on the basis of Boolean algebra. The author uses different kinds of modal valuations instead of truth-functional ones.
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