From: Jim Pryor Date: Sun, 28 Nov 2010 01:28:15 +0000 (-0500) Subject: ass8 tweaks X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=commitdiff_plain;h=ad2f53317266fc3a57ba8dd05a0b90c55ef1d472 ass8 tweaks Signed-off-by: Jim Pryor --- diff --git a/assignment8.mdwn b/assignment8.mdwn index f616de13..c954e955 100644 --- a/assignment8.mdwn +++ b/assignment8.mdwn @@ -96,7 +96,7 @@ * `(null? lst)` tests whether `lst` is the empty list * non-empty lists are implemented as pairs whose second member is a list * `'()` `'(1)` `'(1 2)` `'(1 2 3)` are all lists - * `(list)` `(list 1)` `(list 1 2)` `(list 1 2 3)` are the same lists + * `(list)` `(list 1)` `(list 1 2)` `(list 1 2 3)` are the same lists as the preceding * `'(1 2 3)` and `(cons 1 '(2 3))` are both pairs and lists (the same list) * `(pair? lst)` tests whether `lst` is a pair; if `lst` is a non-empty list, it will also pass this test; if `lst` fails this test, it may be because `lst` is the empty list, or because it's not a list or pair at all * `(car lst)` extracts the first member of a pair / head of a list