null geodesic

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null geodesic

[′nəl ‚jē·ə′des·ik]
(mathematics)
In a Riemannian space, a minimal geodesic curve.
(relativity)
A curve in space-time which has the property that the infinitesimal interval between any two neighboring points on the curve equals zero; it represents a possible path of a light ray. Also known as zero geodesic.