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CLiX (markup), a formal XML schema validation language and method of using valid XML for overlapping markup; Clix (miniatures), a system of miniatures games produced by WizKids; CLIX (Unix version), developed by Intergraph; iriver clix, rebrand of the iriver U10, a multimedia player
Negative numbers: Real numbers that are less than zero. Because zero itself has no sign, neither the positive numbers nor the negative numbers include zero. When zero is a possibility, the following terms are often used: Non-negative numbers: Real numbers that are greater than or equal to zero. Thus a non-negative number is either zero or positive.
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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.
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 ...
A real data type is a data type used in a computer program to represent an approximation of a real number. Because the real numbers are not countable, computers cannot represent them exactly using a finite amount of information. Most often, a computer will use a rational approximation to a real number.
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The set of numbers with two different representations is dense in the reals, [6] but the question of classifying real numbers with unique β-expansions is considerably more subtle than that of integer bases. [7] Another problem is to classify the real numbers whose β-expansions are periodic.