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  2. Number - Wikipedia

    en.wikipedia.org/wiki/Number

    This led to expressions involving the square roots of negative numbers, and eventually to the definition of a new number: a square root of −1, denoted by i, a symbol assigned by Leonhard Euler, and called the imaginary unit. The complex numbers consist of all numbers of the form + where a and b are real numbers.

  3. Natural number - Wikipedia

    en.wikipedia.org/wiki/Natural_number

    A natural number can be used to express the size of a finite set; more precisely, a cardinal number is a measure for the size of a set, which is even suitable for infinite sets. The numbering of cardinals usually begins at zero, to accommodate the empty set. ∅ {\displaystyle \emptyset }

  4. Numeracy - Wikipedia

    en.wikipedia.org/wiki/Numeracy

    They roll three dice, construct an equation from the numbers to produce a new number, then cover that number on the board, trying to get four in a row. Number bingo improves math skills. LPB Laos. Numeracy is the ability to understand, reason with, and apply simple numerical concepts. [1] The charity National Numeracy states: "Numeracy means ...

  5. Dedekind number - Wikipedia

    en.wikipedia.org/wiki/Dedekind_number

    In mathematics, the Dedekind numbers are a rapidly growing sequence of integers named after Richard Dedekind, who defined them in 1897. The Dedekind number M ( n) is the number of monotone boolean functions of n variables. Equivalently, it is the number of antichains of subsets of an n -element set, the number of elements in a free distributive ...

  6. Latchkey kid - Wikipedia

    en.wikipedia.org/wiki/Latchkey_kid

    Latchkey kid. A child with keys to her home hanging from her neck. A latchkey kid, or latchkey child, is a child who returns to an empty home after school (or other activities) or a child who is often left at home with no supervision because their parents are away at work. Such a child can be any age, alone or with siblings who are also under ...

  7. Child mortality - Wikipedia

    en.wikipedia.org/wiki/Child_mortality

    Child mortality refers to number of child deaths under the age of 5 per 1,000 live births. More specific terms include: Perinatal mortality rate: Number of child deaths within the first week of birth ÷ total number of births. [9] Neonatal mortality rate: Number of child deaths within the first 28 days of life ÷ total number of births.

  8. Prime number - Wikipedia

    en.wikipedia.org/wiki/Prime_number

    A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways of writing it as a product, 1 × 5 or 5 × 1, involve 5 itself. However, 4 is composite because it is a ...

  9. Definitions of mathematics - Wikipedia

    en.wikipedia.org/wiki/Definitions_of_mathematics

    The study of the measurement, properties, and relationships of quantities and sets, using numbers and symbols. [16] American Heritage Dictionary, 2000. The science of structure, order, and relation that has evolved from elemental practices of counting, measuring, and describing the shapes of objects. [17]

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