\mathop {\lim }\limits_{H \to 0} \frac{{r\left( H \right)}}
{{\left\| H \right\|}} = 0 \Rightarrow \left( {\forall \varepsilon > 0} \right)\left( {\exists \delta > 0} \right)\left( {\left\| {H - 0} \right\| < \delta \Rightarrow \left\| {\frac{{r\left( H \right)}}
{{\left\| H \right\|}} - 0} \right\| < \varepsilon } \right)