Units in $FD_{2p}$

Abstract

In this paper, we present the structure of the group of *-unitary units in the group algebra $FD_{2p}$, where $F$ is a finite field of characteristic $p > 2$, $D_{2p}$ is the dihedral group of order $2p$, and * is the canonical involution of the group algebra $FD_{2p}$. We also provide the structure of the maximal $p$-subgroup of the unit group $\mathscr{U}(FD_{2p})$ and compute a basis of its center.