Multiplicative Group of Reduced Residues/Examples/Modulo 7

Example of Multiplicative Group of Reduced Residues
Consider the reduced residue system $\Z'_7$ modulo $7$ under modulo multiplication:
 * $\Z'_7 = \set {\eqclass 1 7, \eqclass 2 7, \eqclass 3 7, \eqclass 4 7, \eqclass 5 7, \eqclass 6 7}$

$\struct {\Z'_7, \times_5}$ is the multiplicative group of reduced residues modulo 7.