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  2. Logarithm - Wikipedia

    en.wikipedia.org/wiki/Logarithm

    In mathematics, the logarithm of a number is the exponent by which another fixed value, the base, must be raised to produce that number.For example, the logarithm of 1000 to base 10 is 3, because 1000 is 10 to the 3 rd power: 1000 = 10 3 = 10 × 10 × 10.

  3. Orders of magnitude (time) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(time)

    An order of magnitude of time is usually a decimal prefix or decimal order-of-magnitude quantity together with a base unit of time, like a microsecond or a million years.In some cases, the order of magnitude may be implied (usually 1), like a "second" or "year".

  4. Fibonacci sequence - Wikipedia

    en.wikipedia.org/wiki/Fibonacci_sequence

    [3] [4] [5] They are named after the Italian mathematician Leonardo of Pisa, also known as Fibonacci, who introduced the sequence to Western European mathematics in his 1202 book Liber Abaci. [6] Fibonacci numbers appear unexpectedly often in mathematics, so much so that there is an entire journal dedicated to their study, the Fibonacci Quarterly.

  5. 6 - Wikipedia

    en.wikipedia.org/wiki/6

    Divided in six arias, Hexachordum Apollinis is generally regarded as one of the pinnacles of Johann Pachelbel's oeuvre. [ 39 ] The theme of the sixth album by Dream Theater, Six Degrees of Inner Turbulence , was the number six: the album has six songs, and the sixth song—that is, the complete second disc—explores the stories of six ...

  6. pH - Wikipedia

    en.wikipedia.org/wiki/PH

    The letter p could stand for the French puissance, German Potenz, or Danish potens, ... is ideally equal to ... 1.0–1.5 Vinegar: 2–3 Orange juice: 3.3–4.2

  7. English language - Wikipedia

    en.wikipedia.org/wiki/English_language

    Old English was divided into four dialects: the Anglian dialects (Mercian and Northumbrian) and the Saxon dialects (Kentish and West Saxon). [39] Through the educational reforms of King Alfred in the 9th century and the influence of the kingdom of Wessex , the West Saxon dialect became the standard written variety . [ 40 ]

  8. List of countries by suicide rate - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by...

    8.0: 1.9: 12.7-0.12 Iceland ... are out of the total male population and total female population, respectively, i.e. total number of male suicides divided by the ...

  9. Mass–energy equivalence - Wikipedia

    en.wikipedia.org/wiki/Mass–energy_equivalence

    Mass–energy equivalence states that all objects having mass, or massive objects, have a corresponding intrinsic energy, even when they are stationary.In the rest frame of an object, where by definition it is motionless and so has no momentum, the mass and energy are equal or they differ only by a constant factor, the speed of light squared (c 2).