Symbols

We have already been using symbols. define associates a symbol with a value.

(define pi 3.1415926535)

• Data organization:

  
  (define phone-list
          '((john 3271234) (mary 4440101)))
  

• Patterns:

  
  (define form-letter  '(dear mr name))
  (define opt-patterns '( (= (- x x) 0) ))
  (define formula      '(= f (* m a)))
  

• Rules:

  
  (define rules
      '((all x (if (human x) (mortal x)))))
  

• Lisp programs.

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