Naming Your Own Procedures

• Use define to name lambda expressions:

      (define square (lambda (x) (* x x)))
  

  Now use the name like you would a primitive:

      (square 12)
  

  returns 144

• Previous example x² + xy + y²:

      (define compute
         (lambda (x y) (+ (* x x)
                          (* x y)
  			(* y y))))
  

  Now

      (compute 147273 -98327)
  

  returns 16876623187