Quadric

Ellipse (e = 1/2), parabola (e=1) and hyperbola (e = 2) with fixed focus F and directrix.

In mathematics, a quadric, or quadric surface (quadric hypersurface if D > 2), is any D-dimensional hypersurface in (D + 1)-dimensional space defined as the locus of zeros of a quadratic polynomial. In coordinates x₁, x₂, ..., x_D+1, the general quadric is defined by the algebraic equation

单词	Quadric cone
释义	Quadric cone 英语百科 Quadric In mathematics, a quadric, or quadric surface (quadric hypersurface if D > 2), is any D-dimensional hypersurface in (D + 1)-dimensional space defined as the locus of zeros of a quadratic polynomial. In coordinates x₁, x₂, ..., x_D+1, the general quadric is defined by the algebraic equation
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Quadric cone

Quadric