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FilledSmallSquareVectorQ[expr] gives True if expr is a list, none of whose elements are themselves lists, and gives False otherwise.

FilledSmallSquareVectorQ[expr, test] gives True only if test yields True when applied to each of the elements in expr.

FilledSmallSquareVectorQ[expr, NumberQ] tests whether expr is a vector of numbers.

FilledSmallSquare See The Mathematica Book: Section 2.3.5 and Section 3.7.3.

FilledSmallSquare See also: MatrixQ, TensorRank.

Further Examples