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  2. Psychological pricing - Wikipedia

    en.wikipedia.org/wiki/Psychological_pricing

    Another phenomenon noted by economists is that a price point for a product (such as $4.99) remains stable for a long period of time, with companies slowly reducing the quantity of product in the package until consumers begin to notice. At this time, the price will increase marginally (to $5.05) and then within an exceptionally short time will ...

  3. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    So, starting from 21 (which is a recognizable multiple of 7), take the first digit (2) and convert it into the following in the sequence above: 2 becomes 6. Then add this to the second digit: 6 + 1 = 7. If at any point the first digit is 8 or 9, these become 1 or 2, respectively. But if it is a 7 it should become 0, only if no other digits follow.

  4. Logarithm - Wikipedia

    en.wikipedia.org/wiki/Logarithm

    The algorithm relies on the fact that every real number x where 1 < x < 2 can be represented as a product of distinct factors of the form 1 + 2 −k. The algorithm sequentially builds that product P, starting with P = 1 and k = 1: if P · (1 + 2 −k) < x, then it changes P to P · (1 + 2 −k). It then increases by one regardless.

  5. Natural number - Wikipedia

    en.wikipedia.org/wiki/Natural_number

    The use of a 0 digit in place-value notation (within other numbers) dates back as early as 700 BCE by the Babylonians, who omitted such a digit when it would have been the last symbol in the number. [ b ] The Olmec and Maya civilizations used 0 as a separate number as early as the 1st century BCE , but this usage did not spread beyond Mesoamerica .

  6. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    The number π (/ p aɪ /; spelled out as "pi") is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.

  7. Rounding - Wikipedia

    en.wikipedia.org/wiki/Rounding

    With decimal arithmetic, final digits of 0 and 5 are avoided; if there is a choice between numbers with the least significant digit 0 or 1, 4 or 5, 5 or 6, 9 or 0, then the digit different from 0 or 5 shall be selected; otherwise, the choice is arbitrary. IBM defines that, in the latter case, a digit with the smaller magnitude shall be selected ...

  8. Internet of things - Wikipedia

    en.wikipedia.org/wiki/Internet_of_things

    3.6 Product digitalization. ... Below is a simplified [notes 1] ... The Developing Innovation and Growing the Internet of Things (DIGIT) ...

  9. IPv6 - Wikipedia

    en.wikipedia.org/wiki/IPv6

    For reverse resolution, the IETF reserved the domain ip6.arpa, where the name space is hierarchically divided by the 1-digit hexadecimal representation of nibble units (4 bits) of the IPv6 address. This scheme is defined in RFC 3596 .