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  2. Number line - Wikipedia

    en.wikipedia.org/wiki/Number_line

    A number line is a picture of a straight line that serves as ... the products of real numbers with 1 is a real line within the algebra. For example, in the ...

  3. 20 (number) - Wikipedia

    en.wikipedia.org/wiki/20_(number)

    It has an aliquot sum of 22; a semiprime, within an aliquot sequence of four composite numbers (20, 22, 14, 10, 8) that belong to the prime 7-aliquot tree. It is the smallest primitive abundant number, [5] and the first number to have an abundance of 2, followed by 104.

  4. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    2. Denotes that a number is positive and is read as plus. Redundant, but sometimes used for emphasizing that a number is positive, specially when other numbers in the context are or may be negative; for example, +2. 3. Sometimes used instead of for a disjoint union of sets. − 1.

  5. Line number - Wikipedia

    en.wikipedia.org/wiki/Line_number

    The portion of the line number to the left of the period is known as the "page" or "part", while the portion to the right is known as the "line"; for example, the line number 10.12 refers to page 10, line 12. Branches can target either a page or a line within a page. When the later format is used, the combined page and line is known as a "step".

  6. 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 ...

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  8. Interval (mathematics) - Wikipedia

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

    The addition x + a on the number line. All numbers greater than x and less than x + a fall within that open interval. In mathematics, a real interval is the set of all real numbers lying between two fixed endpoints with no "gaps". Each endpoint is either a real number or positive or negative infinity, indicating the interval extends without a ...

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