Three classic laws

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The three classic laws, or the laws of thought are important rules on which rational speech is said to be founded on. They are the law of identity, the law of noncontradiction and the law of the excluded middle.

v · d Formal logic
Three classic laws   Law of identity · Law of noncontradiction · Law of the excluded middle
Logical constructions   Antecedent · Consequent · Premise · Conclusion · Dichotomy
Logical operators   Negation (not) · Conjunction (and) · Disjunction (or) · Material implication (if then) · Biconditional (if and only if)