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→Классы Σ и Π: dollar signs removed.... what were they doing here in the first place?
|definition =
<tex>\Sigma_{i} = \{L \bigm| \exists R(x,y_{1},\cdots,y_{i}) \in \mathrm{P}, p</tex> {{---}} <tex>poly : \forall x \in L \Leftrightarrow \exists y_{1} \forall y_{2} \exists y_{3} \cdots Q y_{i} : \forall j |y_{j}|~\le~p(|x|), R(x,y_{1},\cdots,y_{i})\},</tex><br/>
где <tex>L</tex> — формальный язык <tex>,Q = \exists</tex> для <tex>i = 2k$-$1,</tex> <tex>Q = \forall</tex> для <tex>i = 2k</tex>.
}}
|definition =
<tex>\Pi_{i} = \{L \bigm| \exists R(x, y_{1},\cdots,y_{i}) \in \mathrm{P}, p</tex> {{---}} <tex>poly : \forall x \in L \Leftrightarrow \forall y_{1} \exists y_{2} \forall y_{3} \cdots Q y_{i} : \forall j |y_{j}|~\le~p(|x|), R(x, y_{1}, \cdots, y_{i}) \},</tex><br/>
где <tex>L</tex> — формальный язык <tex>,Q = \forall</tex> для <tex>i = 2k$-$1,</tex> <tex>Q = \exists</tex> для <tex>i = 2k</tex>.
}}
