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laws of thought
laws of thought In this historical usage, the laws of thought are the three familiar logical formulas of identity, contradiction, and excluded middle.
In this historical usage, the laws of thought are the three familiar logical formulas of identity, contradiction, and excluded middle. The source says they have often been treated as basic laws of reasoning, but argues that this stronger doctrine is not defensible and that the formulas are better understood as clarifying the meanings of terms like “is” and “not.”