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thumbA null vector is a vector for which the quadratic form is zero. Unlike in a Euclidean space, such a vector can be non-zero, in which case it is self-orthogonal.If the quadratic form is indefinite, a pseudo-Euclidean space has a linear cone of null vectors given by . When the pseudo-Euclidean space provides a model for spacetime (see below), the null cone is called the light cone

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