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  2. LogMAR chart - Wikipedia

    en.wikipedia.org/wiki/LogMAR_chart

    The chart was designed by Ian Bailey [5] and Jan E. Lovie-Kitchin at the National Vision Research Institute of Australia. [1] [3] They described their motivation for designing the LogMAR chart as follows: "We have designed a series of near vision charts in which the typeface, size progression, size range, number of words per row and spacings were chosen in an endeavour to achieve a ...

  3. Farey sequence - Wikipedia

    en.wikipedia.org/wiki/Farey_sequence

    In mathematics, the Farey sequence of order n is the sequence of completely reduced fractions, either between 0 and 1, or without this restriction, [ a] which when in lowest terms have denominators less than or equal to n, arranged in order of increasing size. With the restricted definition, each Farey sequence starts with the value 0, denoted ...

  4. Fisher–Yates shuffle - Wikipedia

    en.wikipedia.org/wiki/Fisher–Yates_shuffle

    If such a generator is used to shuffle a deck of 52 playing cards, it can only ever produce a very small fraction of the 52! ≈ 2 225.6 possible permutations [21]. It is impossible for a generator with less than 226 bits of internal state to produce all the possible permutations of a 52-card deck.

  5. Face card - Wikipedia

    en.wikipedia.org/wiki/Face_card

    Face card. In a deck of playing cards, the term face card (US) or court card (British and US), [1] and sometimes royalty, is generally used to describe a card that depicts a person as opposed to the pip cards. In a standard 52-card pack of the English pattern, these cards are the King, Queen and Jack. The term picture card is also common, but ...

  6. Standard 52-card deck - Wikipedia

    en.wikipedia.org/wiki/Standard_52-card_deck

    A standard 52-card French-suited deck comprises 13 ranks in each of the four suits: clubs (♣), diamonds (♦), hearts (♥) and spades (♠). Each suit includes three court cards (face cards), King, Queen and Jack, with reversible (i.e. double headed) images. Each suit also includes ten numeral cards or pip cards, from one (Ace) to ten.

  7. Scratchcard - Wikipedia

    en.wikipedia.org/wiki/Scratchcard

    To win an amount of money in this scratch game the player has to find it three times under the scratch area. A scratchcard (also called a scratch off, scratch ticket, scratcher, scratchum, scratch-it, scratch game, scratch-and-win, instant game, instant lottery, scratchie, lot scrots, or scritchies) is a card designed for competitions, often made of thin cardstock or plastic to conceal PINs ...

  8. Philips circle pattern - Wikipedia

    en.wikipedia.org/wiki/Philips_circle_pattern

    The Philips circle pattern (also referred to as the Philips pattern or PTV Circle pattern) refers to a family of related electronically generated complex television station colour test cards. The content and layout of the original colour circle pattern was designed by Danish engineer Finn Hendil [da] (1939–2011) [1] in the Philips TV & Test ...

  9. Fibonacci sequence - Wikipedia

    en.wikipedia.org/wiki/Fibonacci_sequence

    The convergents of the continued fraction for φ are ratios of successive Fibonacci numbers: φ n = F n+1 / F n is the n-th convergent, and the (n + 1)-st convergent can be found from the recurrence relation φ n+1 = 1 + 1 / φ n. [31] The matrix formed from successive convergents of any continued fraction has a determinant of +1 or −1.

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