6.16.5  Repeated function composition: @@

With Xcas, the repeated composition of a function with itself n ∈ ℕ times is done with the infixed operator @@ (see Section 6.14.1).

Examples.

• Input:
  (sin@@3)(x)
  Output:

  sin

  ⎛ ⎝

  sin

  ⎛ ⎝

  sinx

  ⎞ ⎠

  ⎞ ⎠

• Input:
  (sin@@2)(pi/2)
  Output:

  sin

  ⎛ ⎝

  1

  ⎞ ⎠