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In this paper, we investigate a general formulation for inextensible ‡ows of semi-real quaternionic curve in R 4 2 . We obtain necessary and su¢ cient conditions for inextensible ‡ow of semi-real quaternionic curves. Moreover, we give the evolution equation of curvatures as a partial di¤erential equation.doi:10.1501/commua1_0000000854 fatcat:fitdgn3bjva6jfhaulxxycz22e