出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/06/12 04:22 UTC 版)
In mathematics, a quadric, or quadric surface, is any D-dimensional hypersurface in (D + 1)-dimensional space defined as the locus of zeros of a quadratic polynomial. In coordinates {x1, x2, ..., xD+1}, the general quadric is defined by the algebraic equation
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