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Lituus (mathematics) : ウィキペディア英語版 | Lituus (mathematics)
In mathematics, a lituus is a spiral in which the angle is inversely proportional to the square of the radius (as expressed in polar coordinates).
This spiral, which has two branches depending on the sign of , is asymptotic to the axis. Its points of inflexion are at and . The curve was named for the ancient Roman lituus by Roger Cotes in a collection of papers entitled ''Harmonia Mensurarum'' (1722), which was published six years after his death. ==External links==
* * * (Interactive example using JSXGraph ) *
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「Lituus (mathematics)」の詳細全文を読む
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