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→Пример преобразования
* <tex>T_1=\pi_{G_∗,S_∗,C_∗}(T_0)</tex>
* <tex>T_2=T_1 \div C</tex>
* <tex>T_3=\pi_{G_∗}(T2_T_2)</tex>
* <tex>T=\pi_{G_∗}(\pi_{G_∗,S_∗,C_∗}(\sigma_{P.Points\geq60}((G \bowtie S \times C) \bowtie P)) \bowtie C)</tex>
