Английская Википедия:Cochleoid
Материал из Онлайн справочника
In geometry, a cochleoid is a snail-shaped curve similar to a strophoid which can be represented by the polar equation
- <math>r=\frac{a \sin \theta}{\theta},</math>
- <math>(x^2+y^2)\arctan\frac{y}{x}=ay,</math>
or the parametric equations
- <math>x=\frac{a\sin t\cos t}{t}, \quad y=\frac{a\sin^2 t}{t}.</math>
The cochleoid is the inverse curve of Hippias' quadratrix.[1]
Notes
References
- Шаблон:Cite book
- Cochleoid in the Encyclopedia of Mathematics
- Liliana Luca, Iulian Popescu: A Special Spiral: The Cochleoid. Fiabilitate si Durabilitate - Fiability & Durability no 1(7)/ 2011, Editura "Academica Brâncuşi", Târgu Jiu, Шаблон:Issn
- Roscoe Woods: The Cochlioid. The American Mathematical Monthly, Vol. 31, No. 5 (May, 1924), pp. 222–227 (JSTOR)
- Howard Eves: A Graphometer. The Mathematics Teacher, Vol. 41, No. 7 (November 1948), pp. 311–313 (JSTOR)
External links
- cochleoid at 2dcurves.com
- Шаблон:MathWorld