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Swastika curve : ウィキペディア英語版
Swastika curve

The swastika curve is the name given by Cundy and Rollett〔''Mathematical Models'' by H. Martyn Cundy and A.P. Rollett, second edition, 1961 (Oxford University Press), p. 71.〕 to the quartic plane curve with the Cartesian equation
: y^4-x^4 = xy,\,
or, equivalently, the polar equation
:r^2 = - \tan(2\theta)/2. \,
The curve looks similar to the right-handed swastika, but can be inverted with respect to a unit circle to resemble a left-handed swastika. The Cartesian equation then becomes
: x^4 - y^4 = xy. \,

==External links==

* (Mathworld Article )

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Swastika curve」の詳細全文を読む



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