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Diagonal argument information


A diagonal argument, in mathematics, is a technique employed in the proofs of the following theorems:

  • Cantor's diagonal argument (the earliest)
  • Cantor's theorem
  • Russell's paradox
  • Diagonal lemma
    • Gödel's first incompleteness theorem
    • Tarski's undefinability theorem
  • Halting problem
  • Kleene's recursion theorem

Its category-theoretical general formulation is given by Lawvere's fixed-point theorem.

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Diagonal argument

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A diagonal argument, in mathematics, is a technique employed in the proofs of the following theorems: Cantor's diagonal argument (the earliest) Cantor's...

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Diagonalization

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construction of a diagonal matrix (with nonzero entries only on the main diagonal) that is similar to a given matrix Diagonal argument (disambiguation)...

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Cardinality

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similar argument, N has cardinality strictly less than the cardinality of the set R of all real numbers. For proofs, see Cantor's diagonal argument or Cantor's...

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Cardinal number

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used an argument with nested intervals, but in an 1891 paper, he proved the same result using his ingenious and much simpler diagonal argument. The new...

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Georg Cantor

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subsequently made further important contributions, including his diagonal argument and theorem. However, he never again attained the high level of his...

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Uncountable set

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the set R of all real numbers; Cantor's diagonal argument shows that this set is uncountable. The diagonalization proof technique can also be used to show...

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Cardinality of the continuum

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different infinities. The inequality was later stated more simply in his diagonal argument in 1891. Cantor defined cardinality in terms of bijective functions:...

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Diagonal lemma

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argument in different terms is given in [Raatikainen (2015a)].) The lemma is called "diagonal" because it bears some resemblance to Cantor's diagonal...

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Argument

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An argument is a series of sentences, statements, or propositions some of which are called premises and one is the conclusion. The purpose of an argument...

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Diagonal matrix

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In linear algebra, a diagonal matrix is a matrix in which the entries outside the main diagonal are all zero; the term usually refers to square matrices...

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Continuum hypothesis

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real numbers (see Cantor's first uncountability proof and Cantor's diagonal argument). His proofs, however, give no indication of the extent to which the...

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Subset

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{\displaystyle A\subseteq B} by applying a proof technique known as the element argument: Let sets A and B be given. To prove that A ⊆ B , {\displaystyle A\subseteq...

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Power set

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the set of all functions from Y to X and |XY| = |X||Y|. Cantor's diagonal argument shows that the power set of a set (whether infinite or not) always...

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Argument of a function

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In mathematics, an argument of a function is a value provided to obtain the function's result. It is also called an independent variable. For example,...

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Soundness

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In logic and deductive reasoning, an argument is sound if it is both valid in form and has no false premises. Soundness has a related meaning in mathematical...

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List of mathematical proofs

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problem NP-completeness of the Boolean satisfiability problem Cantor's diagonal argument set is smaller than its power set uncountability of the real numbers...

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Countable set

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it is uncountable. For an elaboration of this result see Cantor's diagonal argument. The set of real numbers is uncountable, and so is the set of all...

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Kolmogorov complexity

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be used to state and prove impossibility results akin to Cantor's diagonal argument, Gödel's incompleteness theorem, and Turing's halting problem. In...

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Mathematics

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showing that this implies different sizes of infinity, per Cantor's diagonal argument. This led to the controversy over Cantor's set theory. In the same...

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Definable real number

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most countably many definable real numbers. However, by Cantor's diagonal argument, there are uncountably many real numbers, so almost every real number...

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Pairing function

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term "diagonal argument" is sometimes used to refer to this type of enumeration, but it is not directly related to Cantor's diagonal argument.[citation...

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Syllogism

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συλλογισμός, syllogismos, 'conclusion, inference') is a kind of logical argument that applies deductive reasoning to arrive at a conclusion based on two...

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