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FilledSmallSquareConstant is an attribute which indicates zero derivative of a symbol with respect to all parameters.

FilledSmallSquareConstant is used by Dt.

FilledSmallSquare Functions f[ ... ] are taken to have zero total derivative if f has attribute Constant.

FilledSmallSquare Mathematical constants such as Pi have attribute Constant.

FilledSmallSquare See The Mathematica Book: Section 2.5.3 and Section 3.5.2.

Further Examples