http://eli.thegreenplace.net/2008/01/05/sicp-section-432/ Eli Bendersky's personal website Fri, 21 Nov 2008 20:29:18 +0000 http://wordpress.org/?v=2.6.2 http://eli.thegreenplace.net/2008/01/05/sicp-section-432/#comment-119501 namin Fri, 18 Apr 2008 16:25:15 +0000 http://eli.thegreenplace.net/2008/01/05/sicp-section-432/#comment-119501 For problem 4.43, you don't need to explicitly unravel the difficult constraint if you keep your information in a list of lists. E.g., ; gabrielle's father owns the yacht that is named after dr. parker's daughter (for-each (lambda (t) (if (eq? (daughter t) 'gabrielle) (require (eq? (boat t) daughter-parker)))) father-daughter-boat-list) For problem 4.43, you don’t need to explicitly unravel the difficult constraint if you keep your information in a list of lists. E.g.,
; gabrielle’s father owns the yacht that is named after dr. parker’s daughter
(for-each
(lambda (t)
(if (eq? (daughter t) ‘gabrielle)
(require (eq? (boat t) daughter-parker))))
father-daughter-boat-list)

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