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    This theory of deductive reasoning – also known as term logic – was developed by Aristotle, but was superseded by propositional (sentential) logic and predicate logic.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

  3. 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 ...

  4. Deduction theorem - Wikipedia

    en.wikipedia.org/wiki/Deduction_theorem

    In more detail, the propositional logic deduction theorem states that if a formula is deducible from a set of assumptions {} then the implication is deducible from ; in symbols, {} implies . In the special case where Δ {\displaystyle \Delta } is the empty set , the deduction theorem claim can be more compactly written as: A ⊢ B ...

  5. Hilbert system - Wikipedia

    en.wikipedia.org/wiki/Hilbert_system

    In a Hilbert system, a formal deduction (or proof) is a finite sequence of formulas in which each formula is either an axiom or is obtained from previous formulas by a rule of inference. These formal deductions are meant to mirror natural-language proofs, although they are far more detailed.

  6. 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)

  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.

  8. Natural deduction - Wikipedia

    en.wikipedia.org/wiki/Natural_deduction

    In logic and proof theory, natural deduction is a kind of proof calculus in which logical reasoning is expressed by inference rules closely related to the "natural" way of reasoning. [1] This contrasts with Hilbert-style systems, which instead use axioms as much as possible to express the logical laws of deductive reasoning.

  9. Rule of inference - Wikipedia

    en.wikipedia.org/wiki/Rule_of_inference

    In the philosophy of logic and logic, specifically in deductive reasoning, a rule of inference, inference rule or transformation rule is a logical form consisting of a function which takes premises, analyzes their syntax, and returns a conclusion (or conclusions).

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