We cover the semantic definitions for propositional logic which assign formulas truth values in a sigma-structure.
00:00 Introduction
00:23 Definition: sigma-structure
01:35 Definition: Truth values for LP formulas
08:47 Definition: Models, tautologies, consistency and contradictions
14:32 Definition: Logical equivalence
The playlist for the course can be found here: https://www.youtube.com/watch?v=0HImO-me_sg
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