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  2. Construction of the real numbers - Wikipedia

    en.wikipedia.org/wiki/Construction_of_the_real...

    An axiomatic definition of the real numbers consists of defining them as the elements of a complete ordered field. [2] [3] [4] This means the following: The real numbers form a set, commonly denoted , containing two distinguished elements denoted 0 and 1, and on which are defined two binary operations and one binary relation; the operations are called addition and multiplication of real ...

  3. Real number - Wikipedia

    en.wikipedia.org/wiki/Real_number

    The real numbers can be constructed as a completion of the rational numbers, in such a way that a sequence defined by a decimal or binary expansion like (3; 3.1; 3.14; 3.141; 3.1415; ...) converges to a unique real number—in this case π. For details and other constructions of real numbers, see Construction of the real numbers.

  4. Completeness of the real numbers - Wikipedia

    en.wikipedia.org/wiki/Completeness_of_the_real...

    There is a construction of the real numbers based on the idea of using Dedekind cuts of rational numbers to name real numbers; e.g. the cut (L,R) described above would name . If one were to repeat the construction of real numbers with Dedekind cuts (i.e., "close" the set of real numbers by adding all possible Dedekind cuts), one would obtain no ...

  5. Dedekind cut - Wikipedia

    en.wikipedia.org/wiki/Dedekind_cut

    Dedekind used his cut to construct the irrational, real numbers.. In mathematics, Dedekind cuts, named after German mathematician Richard Dedekind (but previously considered by Joseph Bertrand [1] [2]), are а method of construction of the real numbers from the rational numbers.

  6. Category:Real numbers - Wikipedia

    en.wikipedia.org/wiki/Category:Real_numbers

    In mathematics, the real numbers are intuitively defined as numbers that are in one-to-one correspondence with the points on an infinite line—the number line. The term "real number" is a retronym coined in response to "imaginary number". Together with the p-adic numbers, the reals are a limit set of the rational numbers.

  7. Cayley–Dickson construction - Wikipedia

    en.wikipedia.org/wiki/Cayley–Dickson_construction

    When this modified construction is applied to , one obtains the split-complex numbers, which are ring-isomorphic to the direct product; following that, one obtains the split-quaternions, an associative algebra isomorphic to that of the 2 × 2 real matrices; and the split-octonions, which are isomorphic to Zorn. Applying the original Cayley ...

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