Operate
 Usage
• Operate[p, f[x, y]] gives p[f][x, y].
• Operate[p, expr, n] applies p at level n in the head of expr.
Notes
• Examples: Operate[p, f[x,y]]  ; Operate[p, f[x][y][z], 1] ; Operate[p, f[x][y][z], 2] . • 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. • New in Version 1.
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