**My first post is about two properties in the elementary set theory. You can see an amazing proof for them from me in the following.**

**In proof I used the following property in logic**

**that is called “constructive dilemma”.**

**First Property:**

**Let** **, then I can write**

**which implies that** **.**

**Second Property:**

**Let** **, then**

**which implies that** **.**

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