Cusp (English spelling)

Japanese: 尖点 - せんてん(英語表記)cusp
Cusp (English spelling)
A singular point in an algebraic curve is a point where the direction of travel reverses when moving along the curve. For example, if the curve y 2 = x 2 ( x + a ) and a = 0, then the curve becomes y 2 = x 3 , and the direction of the curve reverses at the origin (0,0). A common tangent y = 0 can be drawn to the two branches of this function. Such a singular point is called a cusp of the curve. (→ Multiple point )

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
代数曲線における特異点の一つで,曲線に沿って進んだとき,進む方向が逆になる点をいう。たとえば,曲線 y2x2(xa) で a=0 とおけば,この曲線は y2x3 となり,原点 (0,0) において,曲線の方向が逆になり,この関数の2つの分枝には,共通の接線 y=0 が引ける。このような特異点を曲線の尖点という。 (→重複点 )  

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