'Lowest term representation' presentation slideshows

(define <rat> <pair>) (define (make-rat <function>) (method ((n <integer>) (d <integer>))

(define <rat> <pair>) (define (make-rat <function>) (method ((n <integer>) (d <integer>)) (if (= d 0) (begin (print "zero denominator") (pair 0 1)) (pair n d)))) (define (numer <function>) head) (define (denom <function>) tail) Why not

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