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  2. Up tack - Wikipedia

    en.wikipedia.org/wiki/Up_tack

    The truth value 'false', or a logical constant denoting a proposition in logic that is always false (often called "falsum" or "absurdum"). The bottom element in wheel theory and lattice theory, which also represents absurdum when used for logical semantics; The bottom type in type theory, which is the bottom element in the subtype relation.

  3. Truth value - Wikipedia

    en.wikipedia.org/wiki/Truth_value

    In logic and mathematics, a truth value, sometimes called a logical value, is a value indicating the relation of a proposition to truth, which in classical logic has only two possible values (true or false). [1] [2] Truth values are used in computing as well as various types of logic.

  4. Logical equivalence - Wikipedia

    en.wikipedia.org/wiki/Logical_equivalence

    In particular, the truth value of can change from one model to another. On the other hand, the claim that two formulas are logically equivalent is a statement in metalanguage, which expresses a relationship between two statements and . The statements are logically equivalent if, in every model, they have the same truth value.

  5. Tee (symbol) - Wikipedia

    en.wikipedia.org/wiki/Tee_(symbol)

    The tee (⊤, \top in LaTeX), also called down tack (as opposed to the up tack) or verum, [1] is a symbol used to represent: . The top element in lattice theory.; The truth value of being true in logic, or a sentence (e.g., formula in propositional calculus) which is unconditionally true.

  6. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    Algebra (and later, calculus) can thus be used to solve geometrical problems. Geometry was split into two new subfields: synthetic geometry, which uses purely geometrical methods, and analytic geometry, which uses coordinates systemically. [23] Analytic geometry allows the study of curves unrelated to circles and lines.

  7. Foundations of geometry - Wikipedia

    en.wikipedia.org/wiki/Foundations_of_geometry

    Absolute geometry is a geometry based on an axiom system consisting of all the axioms giving Euclidean geometry except for the parallel postulate or any of its alternatives. [69] The term was introduced by János Bolyai in 1832. [70] It is sometimes referred to as neutral geometry, [71] as it is neutral with respect to the parallel postulate.

  8. Truth function - Wikipedia

    en.wikipedia.org/wiki/Truth_function

    In logic, a truth function [1] is a function that accepts truth values as input and produces a unique truth value as output. In other words: the input and output of a truth function are all truth values; a truth function will always output exactly one truth value, and inputting the same truth value(s) will always output the same truth value.

  9. False (logic) - Wikipedia

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

    In a truth-functional system of propositional logic, it is one of two postulated truth values, along with its negation, truth. [2] Usual notations of the false are 0 (especially in Boolean logic and computer science ), O (in prefix notation , O pq ), and the up tack symbol ⊥ {\displaystyle \bot } .