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\[SquareSubset]\[SquareSuperset]

SquareSubsetEqual

SquareSubsetEqual \[SquareSubsetEqual]

FilledSmallSquare Infix set relation operator.

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

FilledSmallSquare See The Mathematica Book: Section 3.10.4.

FilledSmallSquare See also: \[NotSquareSubsetEqual] .

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