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UpSet (^=)Protect

UpSetDelayed

FilledSmallSquarelhs^:=rhs assigns rhs to be the delayed value of lhs, and associates the assignment with symbols that occur at level one in lhs.

FilledSmallSquare See notes for UpSet and SetDelayed.

FilledSmallSquare See The Mathematica Book: Section 2.4.10 and Section 2.4.10.

Further Examples

UpSet (^=)Protect