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Move the "a vector is a tensor of the first order and a scalar is a tensor of order zero" quote to the underdetermined-type section, where the article shows one double serving scalar, vector, and tensor quantities, and add a matrix-vs-tensor paragraph to "The type lies": a matrix is storage, a tensor is defined by its transformation law, so whether a Matrix3d is a tensor is a fact about the quantity, not the type. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>