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2. Conflict-free coloring - Wikipedia

   en.wikipedia.org/wiki/Conflict-free_coloring

   A coloring is an assignment of a color to each vertex of V . A coloring is conflict-free if at least one vertex in each edge has a unique color. If H is a graph, then this condition becomes the standard condition for a legal coloring of a graph: the two vertices adjacent to every edge should have different colors.

3. Coloring book - Wikipedia

   en.wikipedia.org/wiki/Coloring_book

   Coloring book. A coloring book (British English: colouring-in book, colouring book, or colouring page) is a type of book containing line art to which people are intended to add color using crayons, colored pencils, marker pens, paint or other artistic media. Traditional coloring books and coloring pages are printed on paper or card.

4. List coloring - Wikipedia

   en.wikipedia.org/wiki/List_coloring

   List coloring. In graph theory, a branch of mathematics, list coloring is a type of graph coloring where each vertex can be restricted to a list of allowed colors. It was first studied in the 1970s in independent papers by Vizing and by Erdős, Rubin, and Taylor. [1]

5. Graph coloring - Wikipedia

   en.wikipedia.org/wiki/Graph_coloring

   Graph coloring. A proper vertex coloring of the Petersen graph with 3 colors, the minimum number possible. In graph theory, graph coloring is a special case of graph labeling; it is an assignment of labels traditionally called "colors" to elements of a graph subject to certain constraints. In its simplest form, it is a way of coloring the ...

6. Triangle-free graph - Wikipedia

   en.wikipedia.org/wiki/Triangle-free_graph

   Triangle-free graph. In the mathematical area of graph theory, a triangle-free graph is an undirected graph in which no three vertices form a triangle of edges. Triangle-free graphs may be equivalently defined as graphs with clique number ≤ 2, graphs with girth ≥ 4, graphs with no induced 3-cycle, or locally independent graphs.

7. Hand-colouring of photographs - Wikipedia

   en.wikipedia.org/wiki/Hand-colouring_of_photographs

   Hand-colouring of photographs. A hand-coloured daguerreotype by J. Garnier, c. 1850. Hand-colouring (or hand-coloring) refers to any method of manually adding colour to a monochrome photograph, generally either to heighten the realism of the image or for artistic purposes. [ 1] Hand-colouring is also known as hand painting or overpainting.