  In this study, we try to semi-real quaternionic curves in the semi-Euclidean
space E_2^4. Firstly, we introduce algebraic properties of semi-real
quaternions. And then, we give some characterizations of semi-real quaternionic
involute-evolute curves in the semi-Euclidean space E_2^4. Lastly, we
illustrate some examples and draw their figures with Mathematica Programme.
