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  2. Fractional coloring - Wikipedia

    en.wikipedia.org/wiki/Fractional_coloring

    Fractional coloring is a topic in a young branch of graph theory known as fractional graph theory. It is a generalization of ordinary graph coloring. In a traditional graph coloring, each vertex in a graph is assigned some color, and adjacent vertices — those connected by edges — must be assigned different colors.

  3. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    A simple fraction (also known as a common fraction or vulgar fraction, where vulgar is Latin for "common") is a rational number written as a / b or ⁠ ⁠, where a and b are both integers. [9] As with other fractions, the denominator (b) cannot be zero. Examples include ⁠ 1 2 ⁠, − ⁠ 8 5 ⁠, ⁠ −8 5 ⁠, and ⁠ 8 −5 ⁠.

  4. Just-noticeable difference - Wikipedia

    en.wikipedia.org/wiki/Just-noticeable_difference

    For many sensory modalities, over a wide range of stimulus magnitudes sufficiently far from the upper and lower limits of perception, the 'JND' is a fixed proportion of the reference sensory level, and so the ratio of the JND/reference is roughly constant (that is the JND is a constant proportion/percentage of the reference level).

  5. An Elephant Never Forgets - Wikipedia

    en.wikipedia.org/wiki/An_Elephant_Never_Forgets

    The teacher, a swan, sings another song while asking the animals various questions. They all reply that they can't remember, but the elephant proceeds to remind them that he never forgets. This continues until the swan asks the elephant a simple math question, which he shamefully admits to forget, and the class retorts him for it.

  6. Nonogram - Wikipedia

    en.wikipedia.org/wiki/Nonogram

    Nonogram. Nonograms, also known as Hanjie, Paint by Numbers, Picross, Griddlers, and Pic-a-Pix, are picture logic puzzles in which cells in a grid must be colored or left blank according to numbers at the edges of the grid to reveal a hidden picture. In this puzzle, the numbers are a form of discrete tomography that measures how many unbroken ...

  7. Petroleum - Wikipedia

    en.wikipedia.org/wiki/Petroleum

    Petroleum or crude oil, also referred to as simply oil, is a naturally occurring yellowish-black liquid mixture of mainly hydrocarbons, [ 1 ] and is found in geological formations. The name petroleum covers both naturally occurring unprocessed crude oil and petroleum products that consist of refined crude oil.

  8. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    Some students studying math may develop an apprehension or fear about their performance in the subject. This is known as math anxiety or math phobia, and is considered the most prominent of the disorders impacting academic performance. Math anxiety can develop due to various factors such as parental and teacher attitudes, social stereotypes ...

  9. List of Crayola crayon colors - Wikipedia

    en.wikipedia.org/wiki/List_of_Crayola_crayon_colors

    All 16 Crayola Heads 'n Tails crayon colors. The eight Heads 'n Tails Crayons are double-sided and encased in plastic tubes that function much like the ones on Crayola Twistables. Each crayon has two shades of color, for a total of 16 colors, which are approximated by the background colors and hex RGB values below.

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