Can anyone please help with the following problem:

Show that $\displaystyle D_4 $ and $\displaystyle \mathbb{Z}_2$ x $\displaystyle \mathbb{Z}_4$ areisomporphicnot

Be grateful for help with the approach to this problem.

For those who need an update or reaquaintance with $\displaystyle D_4 $ I have attached the relevant pages of Fraleigh: A First Course in Abstract Algebra.

Peter