145 citations · 831 across the 46 of their papers we have counts for
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gr-qc2011★ 1 cited
Covariant Derivatives on Null Submanifolds
Don Hickethier, Tevian Dray
The degenerate nature of the metric on null hypersurfaces makes it difficult to define a covariant derivative on null submanifolds. Recent approaches using decomposition to define…
math.MG2011★ 22 cited
Taxicab Angles and Trigonometry
Kevin Thompson, Tevian Dray
A natural analogue to angles and trigonometry is developed in taxicab geometry. This structure is then analyzed to see which, if any, congruent triangle relations hold. A nice appl…