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  2. Logical reasoning - Wikipedia

    en.wikipedia.org/wiki/Logical_reasoning

    Logical reasoning is a form of thinking that is concerned with arriving at a conclusion in a rigorous way. [1] This happens in the form of inferences by transforming the information present in a set of premises to reach a conclusion.

  3. Abductive reasoning - Wikipedia

    en.wikipedia.org/wiki/Abductive_reasoning

    A Mastermind player uses abduction to infer the secret colors (top) from summaries (bottom left) of discrepancies in their guesses (bottom right).. Abductive reasoning (also called abduction, [1] abductive inference, [1] or retroduction [2]) is a form of logical inference that seeks the simplest and most likely conclusion from a set of observations.

  4. Logic - Wikipedia

    en.wikipedia.org/wiki/Logic

    For example, it has been argued that certain insights of quantum mechanics refute the principle of distributivity in classical logic, which states that the formula () is equivalent to () (). This claim can be used as an empirical argument for the thesis that quantum logic is the correct logical system and should replace classical logic.

  5. Deductive reasoning - Wikipedia

    en.wikipedia.org/wiki/Deductive_reasoning

    In this example, the first statement uses categorical reasoning, saying that all carrot-eaters are definitely quarterbacks. This theory of deductive reasoning – also known as term logic – was developed by Aristotle, but was superseded by propositional (sentential) logic and predicate logic.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]

  6. Reason - Wikipedia

    en.wikipedia.org/wiki/Reason

    Reason is the capacity of consciously applying logic by drawing valid conclusions from new or existing information, with the aim of seeking the truth. [1] It is associated with such characteristically human activities as philosophy, religion, science, language, mathematics, and art, and is normally considered to be a distinguishing ability possessed by humans.

  7. Syllogism - Wikipedia

    en.wikipedia.org/wiki/Syllogism

    A syllogism (Ancient Greek: συλλογισμός, syllogismos, 'conclusion, inference') is a kind of logical argument that applies deductive reasoning to arrive at a conclusion based on two propositions that are asserted or assumed to be true.

  8. Circular reasoning - Wikipedia

    en.wikipedia.org/wiki/Circular_reasoning

    Circular reasoning (Latin: circulus in probando, "circle in proving"; [1] also known as circular logic) is a logical fallacy in which the reasoner begins with what they are trying to end with. [2] Circular reasoning is not a formal logical fallacy, but a pragmatic defect in an argument whereby the premises are just as much in need of proof or ...

  9. First-order logic - Wikipedia

    en.wikipedia.org/wiki/First-order_logic

    Intuitionistic first-order logic uses intuitionistic rather than classical reasoning; for example, ¬¬φ need not be equivalent to φ and ¬ ∀x.φ is in general not equivalent to ∃ x.¬φ . First-order modal logic allows one to describe other possible worlds as well as this contingently true world which we inhabit. In some versions, the ...