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Exercise 2.8 (Solutions)

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0 & 3 & 0 & 1 & 2 \\ \hline \end{array} \] **Solution** Suppose $G=\left\{ 0,1,2,3 \right\}$ i) The ... number form groups with respect to $\times$. **Solution** As $0\in \mathbb{Q}$, multiplicative inverse ... ional number form groups with respect to $+$. **Solution** a- Closure property holds in $\mathbb{Q}$ und... l number form groups with respect to $\times$. **Solution** a- Since for $a,b\in {{\mathbb{Q}}^{+}}$, $ab\