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A de Finetti diagram. The curved line is the expected Hardy–Weinberg frequency as a function of p.. A de Finetti diagram is a ternary plot used in population genetics.It is named after the Italian statistician Bruno de Finetti (1906–1985) and is used to graph the genotype frequencies of populations, where there are two alleles and the population is diploid.
Trilinear coordinates are an example of homogeneous coordinates. The ratio x : y is the ratio of the perpendicular distances from the point to the sides (extended if necessary) opposite vertices A and B respectively; the ratio y : z is the ratio of the perpendicular distances from the point to the sidelines opposite vertices B and C ...
A ternary plot, ternary graph, triangle plot, simplex plot, or Gibbs triangle is a barycentric plot on three variables which sum to a constant. [1] It graphically depicts the ratios of the three variables as positions in an equilateral triangle .
Solution of triangles (Latin: solutio triangulorum) is the main trigonometric problem of finding the characteristics of a triangle (angles and lengths of sides), when some of these are known. The triangle can be located on a plane or on a sphere. Applications requiring triangle solutions include geodesy, astronomy, construction, and navigation.
Some examples of the use of areal coordinates in triangle geometry, Mathematical Gazette 83, November 1999, 472–477. Schindler, Max; Chen, Evan (July 13, 2012). Barycentric Coordinates in Olympiad Geometry (PDF). Retrieved 14 January 2016. Clark Kimberling's Encyclopedia of Triangles Encyclopedia of Triangle Centers. Archived from the ...
The Möller–Trumbore ray-triangle intersection algorithm, named after its inventors Tomas Möller and Ben Trumbore, is a fast method for calculating the intersection of a ray and a triangle in three dimensions without needing precomputation of the plane equation of the plane containing the triangle. [1]
A useful graph that is often associated with a triangulation of a polygon P is the dual graph. Given a triangulation T P of P , one defines the graph G ( T P ) as the graph whose vertex set are the triangles of T P , two vertices (triangles) being adjacent if and only if they share a diagonal.
If the sidelengths of triangle ABC are a, b, c the baricentric coordinates of the Lemoine point are a 2 : b 2 : c 2. It has been described as "one of the crown jewels of modern geometry". [9] There are several earlier references to this point in the mathematical literature details of which are available in John Mackay' history of the symmedian ...