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  2. Division (mathematics) - Wikipedia

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

    A fraction is a division expression where both dividend and divisor are integers (typically called the numerator and denominator), and there is no implication that the division must be evaluated further. A second way to show division is to use the division sign (÷, also known as obelus though the term has additional meanings), common in ...

  3. Natural number - Wikipedia

    en.wikipedia.org/wiki/Natural_number

    To avoid such paradoxes, the formalism was modified so that a natural number is defined as a particular set, and any set that can be put into one-to-one correspondence with that set is said to have that number of elements. [41] In 1881, Charles Sanders Peirce provided the first axiomatization of natural-number arithmetic.

  4. Metre per second - Wikipedia

    en.wikipedia.org/wiki/Metre_per_second

    The metre per second is the unit of both speed (a scalar quantity) and velocity (a vector quantity, which has direction and magnitude) in the International System of Units (SI), equal to the speed of a body covering a distance of one metre in a time of one second.

  5. Positional notation - Wikipedia

    en.wikipedia.org/wiki/Positional_notation

    For example, the time might be 10:25:59 (10 hours 25 minutes 59 seconds). Angles use similar notation. For example, an angle might be 10° ‍ 25′ ‍ 59″ (10 degrees 25 minutes 59 seconds). In both cases, only minutes and seconds use sexagesimal notation—angular degrees can be larger than 59 (one rotation around a circle is 360°, two ...

  6. Doubling time - Wikipedia

    en.wikipedia.org/wiki/Doubling_time

    As an example, Canada's net population growth was 2.7 percent in the year 2022, dividing 72 by 2.7 gives an approximate doubling time of about 27 years. Thus if that growth rate were to remain constant, Canada's population would double from its 2023 figure of about 39 million to about 78 million by 2050.

  7. Significant figures - Wikipedia

    en.wikipedia.org/wiki/Significant_figures

    For quantities created from measured quantities via multiplication and division, the calculated result should have as many significant figures as the least number of significant figures among the measured quantities used in the calculation. [12] For example, 1.234 × 2 = 2.468 ≈ 2; 1.234 × 2.0 = 2. 4 68 ≈ 2.5; 0.01234 × 2 = 0.0 2 468 ≈ 0.02

  8. Nuclear winter - Wikipedia

    en.wikipedia.org/wiki/Nuclear_winter

    Nuclear winter is a severe and prolonged global climatic cooling effect that is hypothesized [1] [2] to occur after widespread firestorms following a large-scale nuclear war. [3]

  9. Nuclear reactor - Wikipedia

    en.wikipedia.org/wiki/Nuclear_reactor

    This enables fast neutrons to dominate, which can effectively be used to constantly replenish the fuel supply. By merely placing cheap unenriched uranium into such a core, the non-fissionable U-238 will be turned into Pu-239, "breeding" fuel. In thorium fuel cycle thorium-232 absorbs a neutron in either a fast or thermal reactor.

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