\[0 < a < 1\]
\[a^{2} < a^{- 2}\text{\ \ \ }\]
\[так\ как\text{\ \ }a^{- 2} = \frac{1}{a^{2}};\ \ \ \ 0 < a < 1.\]
\[Пример:\ \ a = \frac{1}{2}.\]
\[a^{2} = \left( \frac{1}{2} \right)^{2} = \frac{1}{4}\text{\ \ \ \ \ \ }\]
\[a^{- 2} = \left( \frac{1}{2} \right)^{- 2} = 2^{2} = 4.\]