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2. Real number - Wikipedia

   en.wikipedia.org/wiki/Real_number

   The long real line pastes together ℵ 1 * + ℵ 1 copies of the real line plus a single point (here ℵ 1 * denotes the reversed ordering of ℵ 1) to create an ordered set that is "locally" identical to the real numbers, but somehow longer; for instance, there is an order-preserving embedding of ℵ 1 in the long real line but not in the real ...

3. Field (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Field_(mathematics)

   where i is the imaginary unit, i.e., a (non-real) number satisfying i 2 = −1. Addition and multiplication of real numbers are defined in such a way that expressions of this type satisfy all field axioms and thus hold for C. For example, the distributive law enforces (a + bi)(c + di) = ac + bci + adi + bdi 2 = (ac − bd) + (bc + ad)i.

4. List of types of numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_types_of_numbers

   These include infinite and infinitesimal numbers which possess certain properties of the real numbers. Surreal numbers: A number system that includes the hyperreal numbers as well as the ordinals. Fuzzy numbers: A generalization of the real numbers, in which each element is a connected set of possible values with weights.

5. 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 ...

6. Real analysis - Wikipedia

   en.wikipedia.org/wiki/Real_analysis

   The real numbers have various lattice-theoretic properties that are absent in the complex numbers. Also, the real numbers form an ordered field, in which sums and products of positive numbers are also positive. Moreover, the ordering of the real numbers is total, and the real numbers have the least upper bound property:

7. Positive real numbers - Wikipedia

   en.wikipedia.org/wiki/Positive_real_numbers

   Including 0, the set has a semiring structure (0 being the additive identity), known as the probability semiring; taking logarithms (with a choice of base giving a logarithmic unit) gives an isomorphism with the log semiring (with 0 corresponding to ), and its units (the finite numbers, excluding ) correspond to the positive real numbers.