DocumentationMathematicaBuilt-in FunctionsProgrammingAssignments
UpSetDelayed
lhs^:=rhs assigns rhs to be the delayed value of lhs, and associates the assignment with symbols that occur at level one in lhs.
See notes for UpSet and SetDelayed. See Section 2.5.10 and Section 2.5.10. New in Version 1.
Further Examples
lhs^:=rhs assigns rhs to be the delayed value of lhs, and associates the assignment with symbols that occur at level one in lhs. 
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