🅟 Feb 21, 2026
🅤 Feb 22, 2026
Set Theory > Relations
DEF-RU. Let $R$ and $S$ both be relations on $X_1$, $\cdots$, $X_n$ ($n\geq 2$). Then $R\cup S$ is also a relation on $X_1$, $\cdots$, $X_n$ and is called the union relation of $R$ and $S$.
DEF-RU.
Let $R$ and $S$ both be relations on $X_1$, $\cdots$, $X_n$ ($n\geq 2$). Then $R\cup S$ is also a relation on $X_1$, $\cdots$, $X_n$ and is called the union relation of $R$ and $S$.