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  2. Consistent and inconsistent equations - Wikipedia

    en.wikipedia.org/wiki/Consistent_and...

    If a system of equations is inconsistent, then the equations cannot be true together leading to contradictory information, such as the false statements 2 = 1, or + = and + = (which implies 5 = 6). Both types of equation system, inconsistent and consistent, can be any of overdetermined (having more equations than unknowns), underdetermined ...

  3. Consistency - Wikipedia

    en.wikipedia.org/wiki/Consistency

    In theories of arithmetic, such as Peano arithmetic, there is an intricate relationship between the consistency of the theory and its completeness.A theory is complete if, for every formula φ in its language, at least one of φ or ¬φ is a logical consequence of the theory.

  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. Contradiction - Wikipedia

    en.wikipedia.org/wiki/Contradiction

    A system will be said to be inconsistent if it yields the assertion of the unmodified variable p [S in the Newman and Nagel examples]. In other words, the notion of "contradiction" can be dispensed when constructing a proof of consistency; what replaces it is the notion of "mutually exclusive and exhaustive" classes.

  6. Propositional calculus - Wikipedia

    en.wikipedia.org/wiki/Propositional_calculus

    It is inconsistent if it is not consistent. [ 66 ] [ 68 ] An inconsistent formula is also called self-contradictory , [ 1 ] and said to be a self-contradiction , [ 1 ] or simply a contradiction , [ 81 ] [ 82 ] [ 83 ] although this latter name is sometimes reserved specifically for statements of the form ( p ∧ ¬ p ) {\displaystyle (p\land ...

  7. Glossary of logic - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_logic

    The state of containing contradictory elements, which cannot all be true at the same time within a logical framework. inconsistent arithmetic An arithmetic system in which a contradiction can be derived, violating the principle of consistency. indefinite description

  8. Cognitive dissonance - Wikipedia

    en.wikipedia.org/wiki/Cognitive_dissonance

    The contradiction of a belief, ideal, or system of values causes cognitive dissonance that can be resolved by changing the challenged belief, yet, instead of affecting change, the resultant mental stress restores psychological consonance to the person by misperception, rejection, or refutation of the contradiction, seeking moral support from ...

  9. Paradox - Wikipedia

    en.wikipedia.org/wiki/Paradox

    A paradox is a logically self-contradictory statement or a statement that runs contrary to one's expectation. [1] [2] It is a statement that, despite apparently valid reasoning from true or apparently true premises, leads to a seemingly self-contradictory or a logically unacceptable conclusion.