If $\displaystyle{a}{b}={0}\usepackage{cmbright}\Huge\$ , then $\displaystyle{a}={0}\usepackage{cmbright}\Huge\$ or $\displaystyle{b}={0}\usepackage{cmbright}\Huge\$ , or possibly both $\displaystyle{a}\usepackage{cmbright}\Huge\$ and $\displaystyle{b}\usepackage{cmbright}\Huge\$ are equal to $\displaystyle{0}\usepackage{cmbright}\Huge\$ .