We will learn a bit of Lisp in this course:

• Parentheses go outside a function call: (sqrt 2.0)

• Everything is a function call: (+ x 3)

• defun defines a function:
  (defun twice (x) (* 2 x))

• Every function returns a value:

  
  (defun myabs (x)
    (if (<  x 0)
        (- x)
        x ) )
  

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