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In mathematics, the witch of Agnesi (Template:IPA-it), sometimes called the witch of Maria Agnesi is the curve defined as follows.

The Witch of Agnesi with labeled points

Starting with a fixed circle, a point O on the circle is chosen. For any other point A on the circle, the secant line OA is drawn. The point M is diametrically opposite to O. The line OA intersects the tangent of M at the point N. The line parallel to OM through N, and the line perpendicular to OM through A intersect at P. As the point A is varied, the path of P is the witch.

The curve is asymptotic to the line tangent to the fixed circle through the point O.

Equations

An animation showing the construction of the Witch of Agnesi

Suppose the point O is the origin, and that M is on the positive y-axis. Suppose the radius of the circle is a.

Then the curve has Cartesian equation

Note that if a=1/2, then this equation becomes rather simple:

Parametrically, if is the angle between OM and OA, measured clockwise, then the curve is defined by the equations

Another parameterization, with being the angle between OA and the x-axis, increasing anti-clockwise is

Properties

The Witch of Agnesi with parameters a=1, a=2, a=4, and a=8

This centroid of the generating circle (diameter = 2a) is located at .

History

The curve was studied by Pierre de Fermat in 1630. In 1703, Guido Grandi gave a construction for the curve. In 1718 Grandi suggested the name 'versoria' for the curve, the Latin term for sheet, the rope which turns (adjusts the trim of) the sail, and used the Italian word for it, 'versiera', a hint to sinus versus that appeared in his construction.[1]

In 1748, Maria Agnesi published her famous summation treatise Instituzioni analitiche ad uso della gioventù italiana, in which the curve was named according to Grandi, 'versiera'.[1] Coincidentally, the contemporary Italian word 'Aversiera'/'Versiera', derived from Latin 'Adversarius', a nickname for Devil, "Adversary of God", was synonymous with "witch".[2] Probably for this reason Cambridge professor John Colson mistranslated the name of the curve thus. Different modern works about Agnesi and about the curve suggest slightly different guesses how exactly this mistranslation happened.[3][4][5] Struik mentions that:

31 year-old Systems Analyst Bud from Deep River, spends time with pursuits for instance r/c cars, property developers new condo in singapore singapore and books. Last month just traveled to Orkhon Valley Cultural Landscape. On the other hand, Stephen Stigler suggests that Grandi himself "may have been indulging in a play on words".[6]

The Witch of Agnesi is also a fiction novel by Robert Spiller, in which a teacher gives a version of the history of the term.[7]

Application

The cross-section of a single water wave has a shape similar to the Witch of Agnesi.

In addition to its theoretical properties, the curve has applications to real-life phenomena, applications which have only been discovered fairly recently during the late 20th and early 21st centuries. The Cartesian equation (above) has appeared in the modeling of some physical phenomena mathematical models:[8] the equation approximates the spectral line distribution of optical lines and x-rays, as well as the amount of power dissipated in resonant circuits.

Formally, the curve is equivalent to the probability density function of the Cauchy distribution.

The cross-section of a smooth hill also has a similar shape. It has been used as the generic topographic obstacle in a flow in mathematical modeling.[9][10]

See also

Notes

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

References

Template:Wikisource1911Enc



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  • "Witch of Agnesi" at MacTutor's Famous Curves Index
  • "Cubique d'Agnesi" at Encyclopédie des Formes Mathématiques Remarquables (in French)
  • Template:Cite web
  • Template:Cite episode

External links

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  1. 1.0 1.1 C. Truesdell, "Correction and Additions for 'Maria Gaetana Agnesi'", Archive for History of Exact Science 43 (1991), 385-386. 21 year-old Glazier James Grippo from Edam, enjoys hang gliding, industrial property developers in singapore developers in singapore and camping. Finds the entire world an motivating place we have spent 4 months at Alejandro de Humboldt National Park.
    • Per Grandi: "...nata da' seni versi, che da me suole chiamarsi la Versiera in latino pero Versoria..."
  2. Pietro Fanfani, Vocabolario dell' uso toscano, p. 334
  3. Women in Mathematics By Lynn M. Osen (1975) p. 45
  4. "Fermat's Enigma" by Simon Singh p. 100
  5. The universal book of mathematics: from Abracadabra to Zeno's paradoxes By David J. Darling (2004) p. 8
  6. S.M.Stigler, "Cauchy and the witch of Agnesi: An historical note on the Cauchy distribution", Biometrika, 1974, vol. 61, no.2 p. 375-380
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  8. http://www.mathsci.appstate.edu/~sjg/wmm/final/agnesifinal/applications.pdf
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