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Mathematics 7 Online
OpenStudy (anonymous):

Let A1,A2,B1,B2 be arbitrary sets and A = A1 ∪A2, B = B1 ∪B2. Prove that A△B ⊆ (A1△B1) ∪ (A2△B2). where A△B= A ∪ B - A ∩ B

OpenStudy (amistre64):

its just a brute application, you know A and B, replace and work it thru

OpenStudy (anonymous):

I DID BUT I HAVE A MESS NOW!

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