Can anyone explain how to simplify this set arithmetic issue?

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Can anyone help with explaining how to simplify this? X and Y are two sets. Simplify the following:

(Y − X)∩X

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Bahriddin Abdiev On BEST ANSWER

it is empty set since you are taking only other part from X with (Y-X), then intersecting with X.

E.g. Y = [1,2,3,4], X=[3,4,5]. Y-X=[1,2] => (Y − X)∩X = [] = ∅