Sentence relations and truth

Sentence relations and truth

1. Logic and truth

   • Modus ponens
   • Modus tollens
   • Hypothetical syllogism
   • Disjunctive syllogism

2. Necessary truth, A Priori truth and Analyticity

   • A priori
     • Truth that is known before or without experience
   • A posteriori
     • Can only be known on the basis of empirical testing
   • Analytic
   • Synthetic
   • Necessary truths
     • Cannot be denied without forcing a contradiction
   • Contingent truths
     • Can be contradicted, depending on the facts

3. Entailment

   • Paraphrase
     • Sentences which have the same set of entailments

4. Presupposition

   • Presupposition failure
   • Presupposition triggers
   • Semantic presupposition
   • Pragmatic presupposition

5. Synonymy

   • list or collection of synonyms

6. Tautology

   • use of redundant words

7. Contradiction