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UnionPlus \[UnionPlus]

FilledSmallSquare Infix operator.

FilledSmallSquarex y is by default interpreted as UnionPlus[x, y].

FilledSmallSquare Used to denote union of multisets, in which multiplicities of elements are added.

FilledSmallSquare See The Mathematica Book: Section 3.10.4.

FilledSmallSquare See also: \[Union] , \[CirclePlus] .