light tracking into and out of 0 ? A, suggest spacetime topology.

Examples

The light-like vectors of Minkowski space are null vectors.

The four linearly independent biquaternions 1=''l'' = 1 + ''hi'', 1=''n'' = 1 + ''hj'', 1=''m'' = 1 + ''hk'', and 1=''m''^* = 1 - ''hk'' are null vectors and { ''l'', ''n'',

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