logarithmic spiral
51Evolute — In the differential geometry of curves, the evolute of a curve is the locus of all its centers of curvature. Equivalently, it is the envelope of the normals to a curve. The original curve is an involute of its evolute. (Compare and… …
52Spira — may refer to:A surname: * Elijah Spira * Harry Spira * Nathan Nata Spira * Thomas Spira (1923–2005), Professor Emeritus of History at the University of Prince Edward IslandOther:* Spira (Final Fantasy), the world in which the role playing video… …
53Cesàro equation — In geometry, the Cesàro equation of a plane curve is an equation relating curvature (κ) to arc length (s). It may also be given as an equation relating the radius of curvature (R) to arc length. (These are equivalent because R = 1 / κ.) Two… …
54Coxeter's loxodromic sequence of tangent circles — Blue circle 0 is tangent to circles 1, 2 and 3, as well as to preceding circles −1, −2 and −3. In geometry, Coxeter s loxodromic sequence of tangent circles is an infinite sequence of circles arranged such that any four consecutive circles in the …
55Calculus — This article is about the branch of mathematics. For other uses, see Calculus (disambiguation). Topics in Calculus Fundamental theorem Limits of functions Continuity Mean value theorem Differential calculus  Derivative Change of variables …
56Hall effect — For the Colombian band, see The Hall Effect (band). The Hall effect is the production of a voltage difference (the Hall voltage) across an electrical conductor, transverse to an electric current in the conductor and a magnetic field perpendicular …
57Salvador Dalí — This is a Catalan name. The first family name is Dalí and the second is Domènech. Salvador Dalí Salvador Dalí photographed by Carl Van Vechten on November 29, 1939 Birth name …
58X-ray fluorescence — (XRF) is the emission of characteristic secondary (or fluorescent) X rays from a material that has been excited by bombarding with high energy X rays or gamma rays. The phenomenon is widely used for elemental analysis and chemical analysis,… …
59Generating trigonometric tables — In mathematics, tables of trigonometric functions are useful in a number of areas. Before the existence of pocket calculators, trigonometric tables were essential for navigation, science and engineering. The calculation of mathematical tables was …
60John Wallis — Infobox Scientist name = John Wallis box width = 300px |300px image width = 300px caption = birth date = birth date|1616|11|23 birth place = Ashford, Kent, England death date = death date and age|1703|10|28|1616|11|23 death place = Oxford,… …
