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  2. Additive color - Wikipedia

    en.wikipedia.org/wiki/Additive_color

    James Clerk Maxwell, with his color top that he used for investigation of color vision and additive color. Additive color or additive mixing is a property of a color model that predicts the appearance of colors made by coincident component lights, i.e. the perceived color can be predicted by summing the numeric representations of the component ...

  3. CMYK color model - Wikipedia

    en.wikipedia.org/wiki/CMYK_color_model

    The CMYK color model is based on the CMY color model, which omits the black ink. Four-color printing uses black ink in addition to subtractive primaries for several reasons: [2] In traditional preparation of color separations, a red keyline on the black line art marked the outline of solid or tint color areas. In some cases a black keyline was ...

  4. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    [2] In a sense, subtraction is the inverse of addition. That is, c = a − b if and only if c + b = a. In words: the difference of two numbers is the number that gives the first one when added to the second one. Subtraction follows several important patterns. It is anticommutative, meaning that changing the order changes the sign of the answer.

  5. Plus and minus signs - Wikipedia

    en.wikipedia.org/wiki/Plus_and_minus_signs

    The subtraction operator: a binary operator to indicate the operation of subtraction, as in 5 − 3 = 2. Subtraction is the inverse of addition. [1] The function whose value for any real or complex argument is the additive inverse of that argument. For example, if x = 3, then −x = −3, but if x = −3, then −x = +3. Similarly, −(−x) = x.

  6. Graph coloring - Wikipedia

    en.wikipedia.org/wiki/Graph_coloring

    A particular case is L(2,1)-coloring. Oriented coloring Takes into account orientation of edges of the graph Path coloring Models a routing problem in graphs Radio coloring Sum of the distance between the vertices and the difference of their colors is greater than k + 1, where k is a positive integer. Rank coloring

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