  We comment on the article by M. Ozdemir and M. Erdogdu. We indicate that the
exponential map onto the Lorentz group can be obtained in two elementary ways.
The first way utilizes a commutative algebra involving a conjugate of a
semi-skew-symmetric matrix, and the second way is based on the classical
epimorphism from SL(2,C) onto SO_0(3,1)
