Sep 9, 2019 Thread starter #1 S Sara jj New member Sep 9, 2019 2 1) $\cap_{i=1}^{n} A_{i}= A_{1}\setminus \cup_{i=1}^{n}(A_{1}\setminus A_{i})$ 2) $\cap_{i=1}^{\infty} A_{i}= A_{1}\setminus \cup_{i=1}^{\infty}(A_{1}\setminus A_{i})$

1) $\cap_{i=1}^{n} A_{i}= A_{1}\setminus \cup_{i=1}^{n}(A_{1}\setminus A_{i})$ 2) $\cap_{i=1}^{\infty} A_{i}= A_{1}\setminus \cup_{i=1}^{\infty}(A_{1}\setminus A_{i})$

Sep 9, 2019 #2 C Cbarker1 Active member Jan 8, 2013 236 You need to show that there are subsets to each other. For example: Let $A$ and $B$ be sets. Prove that $A=B$, ( to do that you need to show that $A \subseteq B$ and $B\subseteq A$ is true).

You need to show that there are subsets to each other. For example: Let $A$ and $B$ be sets. Prove that $A=B$, ( to do that you need to show that $A \subseteq B$ and $B\subseteq A$ is true).