Hi

apologies for the stupid question.  I was reviewing some teaching material and looked at the following Scheme (form SICP) code about "streams".

(define (integral integrand initial-value dt)
  (define int
    (cons-stream initial-value
                 (add-streams (scale-stream integrand dt)
                              int)))
  int)

The question is how you'd rendered it in Common Lisp or how you would provide some macrology to mimic the inner define.  I know this has been asked before...  I am sure somebody knows the answer.

All the best

--