The rotating disk: Reply to Grünbaum and Janis
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Using the time orthogonal spatial line element, which characterizes the spatial geometry inside a given reference frame in a coordinate-invariant way, the condition for uniform rotating motion without tangential strain is deduced. The results are the same as those previously found by Grunbaum and Janis using another method, and shows that my earlier criticism of their work is not valid.
KeywordsReference Frame Line Element Tangential Strain Spatial Geometry Early Criticism
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