Logic and Logical Philosophy 13:147-162 (2004)

Andrzej Pietruszczak
Nicolaus Copernicus University
In the article "Podstawy analizy metodologicznej kanonów Milla" [2] Jerzy Łoś proposed an operator that refered sentences to temporal moments. Let us look, for example, at a sentence ‘It is raining in Toruń’. From a logical point of view it is a propositional function, which does not have any logical value, unless we point at a temporal context from a fixed set of such contexts. If the sentence was considered today as a description of a state of affairs, it could be true. If it was considered yesterday, it could be false. 1 The operator enables us to connect any sentence p with any temporal context t. Such a complex sentence we read as: a sentence p is realized at a temporal context t (a point of time, an interval of some kind, etc)
Keywords Jerzy Łoś  Minimal Positional Calculus
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DOI 10.12775/LLP.2004.009
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Topological Logic.Nicholas Rescher & James Garson - 1968 - Journal of Symbolic Logic 33 (4):537-548.

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