1.

For any two sets A and B, prove that A ⊂ B A ∩ B = A

Answer»

Let 

p ϵ A ⊂ B. 

⇒ x ϵ B

 Let and p ϵ A ∩ B 

⬄ x ϵ A and x ϵ B 

∴ (A ∩ B) = A.



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