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Extended real number line
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In mathematics, the affinely extended real number system is obtained from the real number system R by adding two elements: +a nd . These new elements are not real numbers. It is useful in describing various limiting behaviors in calculus and mathematical analysis, especially in the theory of measure and integration. The affinely extended real number system is denoted R or [ , +]. The affinely extended real number system should be distinguished from the projectively extended real numbers which has only one infinity, rather than two.

Produktbeschreibung
In mathematics, the affinely extended real number system is obtained from the real number system R by adding two elements: +a nd . These new elements are not real numbers. It is useful in describing various limiting behaviors in calculus and mathematical analysis, especially in the theory of measure and integration. The affinely extended real number system is denoted R or [ , +]. The affinely extended real number system should be distinguished from the projectively extended real numbers which has only one infinity, rather than two.