DEF-RITSC.
Let $R$ and $S$ both be relations on $X_1$, $\cdots$, $X_n$ ($n\geq 2$). Then $R\cap S$ is also a relation on $X_1$, $\cdots$, $X_n$ and is called the intersection relation of $R$ and $S$.
DEF-RITSC.
Let $R$ and $S$ both be relations on $X_1$, $\cdots$, $X_n$ ($n\geq 2$). Then $R\cap S$ is also a relation on $X_1$, $\cdots$, $X_n$ and is called the intersection relation of $R$ and $S$.