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What does it mean to have a big C, a small A in the upper right corner and a small I in the lower right corner in the math set?
It's like C, but it's not C. It's slightly thinner, longer and narrower than C, and it's the symbol of complement set.

CI(A) represents the complement of A in I, and correspondingly, I is the complete set of the whole problem (including all the elements in the problem).

Definition: ci (a) = {x | x belongs to I, and x does not belong to a}.

It is known that b ∩ a = {2}, b ∩ ci (a) = {4},

So b = {2 2,4}.

Because ci (a) ∩ b = {4}, ci (a) ∩ ci (b) = {1, 5},

So ci (a) = {1, 4,5}, then a = {2 2,3}.

So 3 belongs to a, and 3 doesn't belong to B.

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