(define tolerance 0.00001)

(define (fixed-point f first-guess)
  (define (close-enough? v1 v2)
    (< (abs (- v1 v2)) tolerance))
      (define (try guess)
	(let ((next (f guess)))
	  (if (close-enough? guess next)
	    next
	    (try next))))
	  (try first-guess))

(define (f x)
  (+ 1 (/ 1 x)))