Quadric

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Quadric
In mathematics, a quadric, or quadric surface, is any D-dimensional hypersurface defined as the locus of zeros of a quadratic polynomial. In coordinates , the general quadric is defined by the algebraic equation where Q is a (D + 1)-dimensional  matrix and P is a (D + 1)-dimensional  vector and R a constant. The values Q, P and R are often taken to be real numbers or complex numbers, but in fact, a quadric may be defined over any ring. In general, the locus of zeros of a set of polynomials is known as an algebraic variety, and is studied in the branch of algebraic geometry.
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Quadrique
En géométrie euclidienne, une quadrique, ou surface quadratique, est une surface de l'espace euclidien de dimension 3, lieu des points vérifiant une équation cartésienne de degré 2 les coefficients A à J étant réels, avec A,B,C,D,E,F non tous nuls.
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Quadratische Form
Eine quadratische Form ist in der Mathematik eine Funktion, die sich in einigen Aspekten wie verhält. Das bekannteste Beispiel ist das Quadrat des Betrages eines Vektors.
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Quadrica
In matematica e in particolare in geometria una quadrica (o superficie quadrica) è una (iper-)superficie di uno spazio D-dimensionale sui complessi o sui reali rappresentata da un'equazione polinomiale del secondo ordine nelle variabili spaziali (coordinate). Se le coordinate spaziali sono , allora la generale quadrica nello spazio CD (o RD) è definita da un'equazione della forma dove Q è una matrice (non nulla), P un vettore e R una costante.
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Kwadratisch oppervlak
Een kwadratisch oppervlak kan omschreven worden als een D-dimensionaal oppervlak dat door een vergelijking van tweede orde beschreven wordt. In een coördinatensysteem als , is de algemene omschrijving als volgt: Hierin zijn Q, P en R de variabelen.
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