Matches in DBpedia 2016-04 for { ?s ?p "In relativity, a null surface is a 3-surface whose normal vector is everywhere null (zero length with respect to the local Lorentz metric), but the vector is not identically zero. For example, light cones are null surfaces.An alternative characterization is that the tangent space at any point contains vectors that are all space-like except in one direction, in which vectors have a null "length"."@en }
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- Q16977871 comment "In relativity, a null surface is a 3-surface whose normal vector is everywhere null (zero length with respect to the local Lorentz metric), but the vector is not identically zero. For example, light cones are null surfaces.An alternative characterization is that the tangent space at any point contains vectors that are all space-like except in one direction, in which vectors have a null "length".".