- #1
karush
Gold Member
MHB
- 3,269
- 5
$\textsf{Write out a complete Cayley table for $D_3$. Is $D_3$ Abelian?}$
$$
\begin{array}{ l | l l l l l l}
&R_0 &R_{120} &R_{240} &V &D_L &D_R\\
\hline
R_0 & R_0 & R_{120} &R_{240} & V &D_L &D_R\\
R_{120} & R_{120} & R_{240} &R_0 &D_L &D_R & V\\
R_{240} & R_{240} & R_0 &R_{120} &D_R & V &D_L\\
V & V &D_R &D_L & R_0 &R_{240} & R_{120}\\
D_L &D_L & V &D_R &R_{120} & R_0 &R_{240}\\
D_R &D_R &D_L & V &R_{240} & R_{120}& R_0
\end{array}
%$$
$\textsf{Is $D_3$ Abelian?}$
all I know is if it is Abelian then $AB=BA$ in all choices... so ?
$$
\begin{array}{ l | l l l l l l}
&R_0 &R_{120} &R_{240} &V &D_L &D_R\\
\hline
R_0 & R_0 & R_{120} &R_{240} & V &D_L &D_R\\
R_{120} & R_{120} & R_{240} &R_0 &D_L &D_R & V\\
R_{240} & R_{240} & R_0 &R_{120} &D_R & V &D_L\\
V & V &D_R &D_L & R_0 &R_{240} & R_{120}\\
D_L &D_L & V &D_R &R_{120} & R_0 &R_{240}\\
D_R &D_R &D_L & V &R_{240} & R_{120}& R_0
\end{array}
%$$
$\textsf{Is $D_3$ Abelian?}$
all I know is if it is Abelian then $AB=BA$ in all choices... so ?