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→Разность R1 \setminus R2
R <font color = grey>::</font> R1<font color = grey>,</font> R2
=== Разность <tex>R1 \setminus smallsetminus R2</tex> ===
R <font color = grey>::</font> R1 <font color = blue>where $\lnot\exists$</font>R2 <font color = grey>(</font>R1 <font color = grey>=</font> R2<font color = grey>)</font>
