A-B = A ∆ (A intersection B)

1.	A-B = A ∆ (A intersection B)
Answer» A-B means everything in A except for anything in A∩BA-B=A∩Bc (A intersect B complement)pick an element xlet x∈(A-B)therefore x∈A but x∉Bx∉B means x∈Bcx∈A and x∈Bcx∈(A∩Bc)x∈(A-B)therefore A-B=A∩Bc

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