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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. 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    This theory of deductive reasoning – also known as term logic – was developed by Aristotle, but was superseded by propositional (sentential) logic and predicate logic.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 ...

  4. 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.

  5. 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 ...

  6. Formal system - Wikipedia

    en.wikipedia.org/wiki/Formal_system

    Formal language, which is a set of well-formed formulas, which are strings of symbols from an alphabet, formed by a formal grammar (consisting of production rules or formation rules). Deductive system, deductive apparatus, or proof system, which has rules of inference that take axioms and infers theorems, both of which are part of the formal ...

  7. Deduction and induction - Wikipedia

    en.wikipedia.org/wiki/Deduction_and_induction

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

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