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  2. Wheel graph - Wikipedia

    en.wikipedia.org/wiki/Wheel_graph

    Wheel graph. In the mathematical discipline of graph theory, a wheel graph is a graph formed by connecting a single universal vertex to all vertices of a cycle. A wheel graph with n vertices can also be defined as the 1- skeleton of an (n – 1)-gonal pyramid. Some authors [1] write Wn to denote a wheel graph with n vertices (n ≥ 4); other ...

  3. Domain coloring - Wikipedia

    en.wikipedia.org/wiki/Domain_coloring

    Domain coloring plot of the function f(x) = ⁠ (x2 − 1) (x − 2 − i) 2 x2 + 2 + 2 i⁠, using the structured color function described below. In complex analysis, domain coloring or a color wheel graph is a technique for visualizing complex functions by assigning a color to each point of the complex plane. By assigning points on the ...

  4. Jefferson disk - Wikipedia

    en.wikipedia.org/wiki/Jefferson_disk

    A disk cipher device of the Jefferson type from the 2nd quarter of the 19th century in the National Cryptologic Museum. The Jefferson disk, also called the Bazeries cylinder or wheel cypher, [1] was a cipher system commonly attributed to Thomas Jefferson that uses a set of wheels or disks, each with letters of the alphabet arranged around their edge in an order, which is different for each ...

  5. Volvelle - Wikipedia

    en.wikipedia.org/wiki/Volvelle

    A volvelle or wheel chart is a type of slide chart, a paper construction with rotating parts. It is considered an early example of a paper analog computer. [1] Volvelles have been produced to accommodate organization and calculation in many diverse subjects. Early examples of volvelles are found in the pages of astronomy books.

  6. Color wheel - Wikipedia

    en.wikipedia.org/wiki/Color_wheel

    A color wheel or color circle [1] is an abstract illustrative organization of color hues around a circle, which shows the relationships between primary colors, secondary colors, tertiary colors etc. Some sources use the terms color wheel and color circle interchangeably; [ 2 ] [ 3 ] however, one term or the other may be more prevalent in ...

  7. Rainbow coloring - Wikipedia

    en.wikipedia.org/wiki/Rainbow_coloring

    Rainbow coloring. Rainbow coloring of a wheel graph, with three colors. Every two non-adjacent vertices can be connected by a rainbow path, either directly through the center vertex (bottom left) or by detouring around one triangle to avoid a repeated edge color (bottom right). In graph theory, a path in an edge-colored graph is said to be ...

  8. Wheel theory - Wikipedia

    en.wikipedia.org/wiki/Wheel_theory

    A wheel is a type of algebra (in the sense of universal algebra) where division is always defined. In particular, division by zero is meaningful. The real numbers can be extended to a wheel, as can any commutative ring. The term wheel is inspired by the topological picture of the real projective line together with an extra point ⊥ (bottom ...

  9. 52 Helpful Things On The Web That Are Free And That ... - AOL

    www.aol.com/52-helpful-things-free-everyone...

    Image credits: BandicootSVK #9. I try and post this every time it comes up, but if you're in the USA and you earn less than a certain amount of money -- currently $79,000 -- you can use the same ...