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What do you mean by the term difference of sets
The difference of sets A from B, denoted by A - B, is the set defined as A - B = {x | x ∈A ⋀ x ∉ B} Example 1: If A = {1, 2, 3} and B = {1, 2, 4, 5}, then A - B = {3}. Example 2: If A = {1, 2, 3} and B = {4, 5}, then A - B = {1, 2, 3}. Note that in general A - B ≠ B - A