Scheme like question

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 -- Marco Antoniotti, Professor tel. +39 - 02 64 48 79 01 DISCo, Università Milano Bicocca U14 2043 http://dcb.disco.unimib.it Viale Sarca 336 I-20126 Milan (MI) ITALY