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    Positive Timelike

    Definition

    A nonzero vector v = (v_0, v_1, ..., v_(n - 1)) in n-dimensional Lorentzian space R^(1, n - 1) is said to be positive timelike if it has imaginary (Lorentzian) norm and if its first component v_0 is positive. Symbolically, v is positive timelike if both -v_0^2 + v_1^2 + ... + v_(n - 1)^2<0 and v_0>0 hold. Note that equation (-2) above expresses the imaginary norm condition by saying, equivalently, that the vector v has a negative squared norm.

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