] gives a list of the dimensions of expr.
] gives a list of the dimensions of expr down to level n.
expr must be a full array, with all the pieces of expr at a particular level having the same length. (The elements of expr can then be thought of as filling up a hyper-rectangular region.)
Each successive level in expr sampled by Dimensions must have the same head.
See the Mathematica book: Section 1.8.3, Section 3.7.3.
See also: TensorRank, VectorQ, MatrixQ.
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