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Operate[p, f[x, y]]
gives p[f][x, y].
Operate[p, expr, n]
applies p at level n in the head of expr.
  • Operate[p, f[x]] effectively applies the functional operator p to the function f.
  • Operate is essentially a generalization of Apply, which allows you to apply an operator to the head of an expression, rather than simply to replace the head.  »
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