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  2. Deduction theorem - Wikipedia

    en.wikipedia.org/wiki/Deduction_theorem

    In practice, it is usually enough to know that we could do this. We normally use the natural-deductive form in place of the much longer axiomatic proof. First, we write a proof using a natural-deduction like method: Q 1. hypothesis Q→R 2. hypothesis; R 3. modus ponens 1,2 (Q→R)→R 4. deduction from 2 to 3; Q→((Q→R)→R) 5. deduction ...

  3. Mathematical proof - Wikipedia

    en.wikipedia.org/wiki/Mathematical_proof

    A mathematical proof is a deductive argument for a mathematical statement, showing that the stated assumptions logically guarantee the conclusion. The argument may use other previously established statements, such as theorems ; but every proof can, in principle, be constructed using only certain basic or original assumptions known as axioms ...

  4. Deductive reasoning - Wikipedia

    en.wikipedia.org/wiki/Deductive_reasoning

    This theory of deductive reasoning – also known as term logic – was developed by Aristotle, but was superseded by propositional (sentential) logic and predicate logic. [citation needed] Deductive reasoning can be contrasted with inductive reasoning, in regards to validity and soundness. In cases of inductive reasoning, even though the ...

  5. Modus tollens - Wikipedia

    en.wikipedia.org/wiki/Modus_tollens

    In propositional logic, modus tollens (/ ˈ m oʊ d ə s ˈ t ɒ l ɛ n z /) (MT), also known as modus tollendo tollens (Latin for "mode that by denying denies") [2] and denying the consequent, [3] is a deductive argument form and a rule of inference. Modus tollens is a mixed hypothetical syllogism that takes the form of "If P, then Q. Not Q ...

  6. Deduction and induction - Wikipedia

    en.wikipedia.org/wiki/Deduction_and_induction

    Download as PDF; Printable version; In other projects ... Deduction and induction may refer to: Deductive reasoning; Inductive reasoning; Validity (logic)

  7. Formal proof - Wikipedia

    en.wikipedia.org/wiki/Formal_proof

    The theorem is a syntactic consequence of all the well-formed formulas preceding it in the proof. For a well-formed formula to qualify as part of a proof, it must be the result of applying a rule of the deductive apparatus (of some formal system) to the previous well-formed formulas in the proof sequence.

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