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  2. Parallel curve - Wikipedia

    en.wikipedia.org/wiki/Parallel_curve

    Parallel curves of the graph of = ⁡ for distances =, …, Two definitions of a parallel curve: 1) envelope of a family of congruent circles, 2) by a fixed normal distance The parallel curves of a circle (red) are circles, too

  3. Multigraph - Wikipedia

    en.wikipedia.org/wiki/Multigraph

    A multigraph with multiple edges (red) and several loops (blue). Not all authors allow multigraphs to have loops. In mathematics, and more specifically in graph theory, a multigraph is a graph which is permitted to have multiple edges (also called parallel edges [1]), that is, edges that have the same end nodes.

  4. Parallel (geometry) - Wikipedia

    en.wikipedia.org/wiki/Parallel_(geometry)

    Line art drawing of parallel lines and curves. In geometry, parallel lines are coplanar infinite straight lines that do not intersect at any point. Parallel planes are planes in the same three-dimensional space that never meet. Parallel curves are curves that do not touch each other or intersect and keep a fixed minimum distance. In three ...

  5. Parallel coordinates - Wikipedia

    en.wikipedia.org/wiki/Parallel_coordinates

    The use of Parallel Coordinates as a visualization technique to show data is also often said to have originated earlier with Henry Gannett in work preceding the Statistical Atlas of the United States for the 1890 Census, for example his "General Summary, Showing the Rank of States, by Ratios, 1880", [2] that shows the rank of 10 measures ...

  6. List of curves - Wikipedia

    en.wikipedia.org/wiki/List_of_curves

    Negative pedal curve. Fish curve; Orthotomic; Parallel curve; Pedal curve; Radial curve ... An elementary treatise on cubic and quartic curves by Alfred Barnard ...

  7. Contour line - Wikipedia

    en.wikipedia.org/wiki/Contour_line

    A contour line (also isoline, isopleth, isoquant or isarithm) of a function of two variables is a curve along which the function has a constant value, so that the curve joins points of equal value. [1] [2] It is a plane section of the three-dimensional graph of the function (,) parallel to the (,)-plane. More generally, a contour line for a ...

  8. 9 Christmas traditions in England that probably confuse Americans

    www.aol.com/9-christmas-traditions-england...

    You might hear "Chrimbo" if you're in the UK. Richard Stonehouse/ Getty Images. In the UK, you're likely to hear "Happy Christmas" instead of "Merry Christmas," and "Father Christmas" instead of ...

  9. Envelope (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Envelope_(mathematics)

    The following example shows that in some cases the envelope of a family of curves may be seen as the topologic boundary of a union of sets, whose boundaries are the curves of the envelope. For s > 0 {\displaystyle s>0} and t > 0 {\displaystyle t>0} consider the (open) right triangle in a Cartesian plane with vertices ( 0 , 0 ) {\displaystyle (0 ...