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    This theory of deductive reasoning – also known as term logic – was developed by Aristotle, but was superseded by propositional (sentential) logic and predicate logic.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

    en.wikipedia.org/wiki/Validity_(logic)

    Argument terminology used in logic. In logic, an argument is a set of related statements expressing the premises (which may consists of non-empirical evidence, empirical evidence or may contain some axiomatic truths) and a necessary conclusion based on the relationship of the premises.

  5. 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 ...

  6. 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 ...

  7. 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.

  8. 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)

  9. 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 ...

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