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Hypercone

In geometry, a hypercone (or spherical cone) is the figure in the 4-dimensional Euclidean space represented by the equation x2+y2+z2−w2=0.{\displaystyle x^{2}+y^{2}+z^{2}-w^{2}=0.}It is a quadric surface, and is one of the possible 3-manifolds which are 4-dimensional equivalents of the conical surface in 3 dimensions.

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