hyperbola

🇬🇧/haɪˈpɜːbələ/ 🇺🇸/haɪˈpɜːrbələ/
Standard equation: x²/a² – y²/b² = 1 where 2a is the distance between the two intersections with the x-axis and b = a√(e² – 1), where e is the eccentricity 双曲线

noun [抽象名词][数] 双曲线

Hyperbola from Four Points.
由四点作双曲线。

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That is the contour plot of f with a hyperbola on top of it. 上面这个是f的等高线,黄色的就是双曲线。
A hyperbola approaches but does not meet its asymptote. 双曲线逐渐接近它的渐近线但不相交。