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Download as PDF; Printable version; In other projects ... Pages in category "Sets of real numbers" ... Smith–Volterra–Cantor set; Stoneham number; U.
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 ...
More generally, the solution set to an arbitrary collection E of relations (E i) (i varying in some index set I) for a collection of unknowns (), supposed to take values in respective spaces (), is the set S of all solutions to the relations E, where a solution () is a family of values (()) such that substituting () by () in the collection E makes all relations "true".
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 ...
A natural example of such a question concerning positive-dimensional systems is the following: decide if a polynomial system over the rational numbers has a finite number of real solutions and compute them. A generalization of this question is find at least one solution in each connected component of the set of real solutions of a polynomial ...
The rationals are a dense subset of the real numbers; every real number has rational numbers arbitrarily close to it. [6] A related property is that rational numbers are the only numbers with finite expansions as regular continued fractions. [18] In the usual topology of the real numbers, the rationals are neither an open set nor a closed set. [19]
But clearly not all real numbers are solutions to the original equation. The problem is that multiplication by zero is not invertible : if we multiply by any nonzero value, we can reverse the step by dividing by the same value, but division by zero is not defined, so multiplication by zero cannot be reversed.
Thus the real numbers definable in the language of set theory include all familiar real numbers such as 0, 1, , , et cetera, along with all algebraic numbers. Assuming that they form a set in the model, the real numbers definable in the language of set theory over a particular model of ZFC form a field.
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