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  2. Proof by contradiction - Wikipedia

    en.wikipedia.org/wiki/Proof_by_contradiction

    More broadly, proof by contradiction is any form of argument that establishes a statement by arriving at a contradiction, even when the initial assumption is not the negation of the statement to be proved. In this general sense, proof by contradiction is also known as indirect proof, proof by assuming the opposite, [2] and reductio ad ...

  3. Square of opposition - Wikipedia

    en.wikipedia.org/wiki/Square_of_opposition

    Since every statement has the contradictory opposite (its negation), and since a contradicting statement is true when its opposite is false, it follows that the opposites of contraries (which the medievals called subcontraries, subcontrariae) can both be true, but they cannot both be false. Since subcontraries are negations of universal ...

  4. Oxymoron - Wikipedia

    en.wikipedia.org/wiki/Oxymoron

    Oxymorons in the narrow sense are a rhetorical device used deliberately by the speaker and intended to be understood as such by the listener. In a more extended sense, the term "oxymoron" has also been applied to inadvertent or incidental contradictions, as in the case of "dead metaphors" ("barely clothed" or "terribly good").

  5. Law of noncontradiction - Wikipedia

    en.wikipedia.org/wiki/Law_of_noncontradiction

    In logic, the law of non-contradiction (LNC; also known as the law of contradiction, principle of non-contradiction (PNC), or the principle of contradiction) states that contradictory propositions cannot both be true in the same sense at the same time, e. g. the two propositions "the house is white" and "the house is not white" are mutually exclusive.

  6. List of fallacies - Wikipedia

    en.wikipedia.org/wiki/List_of_fallacies

    Judgmental language – using insulting or pejorative language in an argument. Pooh-pooh – stating that an opponent's argument is unworthy of consideration. [84] Style over substance – embellishing an argument with compelling language, exploiting a bias towards the esthetic qualities of an argument, e.g. the rhyme-as-reason effect [85]

  7. Literal and figurative language - Wikipedia

    en.wikipedia.org/.../Literal_and_figurative_language

    An oxymoron is a figure of speech in which a pair of opposite or contradictory terms is used together for emphasis. [27] Examples: Organized chaos, Same difference, Bittersweet. A paradox is a statement or proposition which is self-contradictory, unreasonable, or illogical. [28] Example: This statement is a lie.

  8. Contradiction - Wikipedia

    en.wikipedia.org/wiki/Contradiction

    This contradiction, as opposed to metaphysical thinking, is not an objectively impossible thing, because these contradicting forces exist in objective reality, not cancelling each other out, but actually defining each other's existence. According to Marxist theory, such a contradiction can be found, for example, in the fact that:

  9. Antithesis - Wikipedia

    en.wikipedia.org/wiki/Antithesis

    An antithesis must always contain two ideas within one statement. The ideas may not be structurally opposite, but they serve to be functionally opposite when comparing two ideas for emphasis. [4] According to Aristotle, the use of an antithesis makes the audience better understand the point the speaker is trying to make. Further explained, the ...