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  2. Four fours - Wikipedia

    en.wikipedia.org/wiki/Four_fours

    Four fours. Four fours is a mathematical puzzle, the goal of which is to find the simplest mathematical expression for every whole number from 0 to some maximum, using only common mathematical symbols and the digit four. No other digit is allowed. Most versions of the puzzle require that each expression have exactly four fours, but some ...

  3. Four square - Wikipedia

    en.wikipedia.org/wiki/Four_square

    Four square[1] (also called handball, champ, four squares or box ball) is a global sport played on a square court divided by two perpendicular lines into four identical boxes creating four squares labelled 1–4 or A–D. [2] Four square is a popular game at elementary schools with little required equipment, almost no setup, and short rounds of ...

  4. Four Horsemen of the Apocalypse - Wikipedia

    en.wikipedia.org/wiki/Four_Horsemen_of_the...

    The Four Horsemen of the Apocalypse[1] are figures in the Book of Revelation in the New Testament of the Bible, a piece of apocalypse literature attributed to John of Patmos, and generally regarded as dating to about AD 95. Similar allusions are contained in the Old Testament books of Ezekiel and Zechariah, written about six centuries prior.

  5. 4 - Wikipedia

    en.wikipedia.org/wiki/4

    Two modern handwritten fours Sculpted date "1481" in the Convent church of Maria Steinach in Algund, South Tirol, Italy.The upward loop signifies the number 4. Brahmic numerals represented 1, 2, and 3 with as many lines. 4 was simplified by joining its four lines into a cross that looks like the modern plus sign.

  6. Four color theorem - Wikipedia

    en.wikipedia.org/wiki/Four_color_theorem

    A four-colored map of the states of the United States (ignoring lakes and oceans) In mathematics, the four color theorem, or the four color map theorem, states that no more than four colors are required to color the regions of any map so that no two adjacent regions have the same color. Adjacent means that two regions share a common boundary of ...

  7. All fours (card game) - Wikipedia

    en.wikipedia.org/wiki/All_Fours_(card_game)

    All fours is a traditional English card game, once popular in pubs and taverns as well as among the gentry, that flourished as a gambling game until the end of the 19th century. It is a trick-taking card game that was originally designed for two players, but developed variants for more players. According to Charles Cotton, the game originated ...

  8. Fourth grade - Wikipedia

    en.wikipedia.org/wiki/Fourth_grade

    In India, where children enter Class 4 at the ages 9 to 10 it is called Lower Primary, it is known as the fourth grade. 5-7 standard categories as Upper Primary (UP). Lower Primary gives the basic education necessary for a kid and when they get to the UP section, advanced knowledge will be provided via lessons or modules. [citation needed]

  9. Four-dimensional space - Wikipedia

    en.wikipedia.org/wiki/Four-dimensional_space

    Mathematically, a four-dimensional space is a space that needs four parameters to specify a point in it. For example, a general point might have position vector a, equal to. This can be written in terms of the four standard basis vectors (e1, e2, e3, e4), given by. so the general vector a is. Vectors add, subtract and scale as in three ...

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