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week3 evaluator fix
[lambda.git]
/
assignment_3_evaluator.mdwn
diff --git
a/assignment_3_evaluator.mdwn
b/assignment_3_evaluator.mdwn
index
b0835a9
..
9207c05
100644
(file)
--- a/
assignment_3_evaluator.mdwn
+++ b/
assignment_3_evaluator.mdwn
@@
-5,23
+5,23
@@
Here are the definitions pre-loaded for working on assignment 3:
let true = \x y. x in
let false = \x y. y in
let and = \l r. l (r true false) false in
let true = \x y. x in
let false = \x y. y in
let and = \l r. l (r true false) false in
-let make_pair = \f s g. g f s in
+let make
\
_pair = \f s g. g f s in
let fst = true in
let snd = false in
let fst = true in
let snd = false in
-let empty = make_pair true junk in
+let empty = make
\
_pair true junk in
let isempty = \x. x fst in
let isempty = \x. x fst in
-let make
_list = \h t. make_pair false (make
_pair h t) in
+let make
\_list = \h t. make\_pair false (make\
_pair h t) in
let head = \l. isempty l err (l snd fst) in
let tail = \l. isempty l err (l snd snd) in
; a list of numbers to experiment on
let head = \l. isempty l err (l snd fst) in
let tail = \l. isempty l err (l snd snd) in
; a list of numbers to experiment on
-let mylist = make
_list 1 (make_list 2 (make
_list 3 empty)) in
+let mylist = make
\_list 1 (make\_list 2 (make\
_list 3 empty)) in
; church numerals
let iszero = \n. n (\x. false) true in
let succ = \n s z. s (n s z) in
let mul = \m n s. m (n s) in
; church numerals
let iszero = \n. n (\x. false) true in
let succ = \n s z. s (n s z) in
let mul = \m n s. m (n s) in
-let pred = \n. iszero n 0 (length (tail (n (\p. make_list junk p) empty))) in
+let pred = \n. iszero n 0 (length (tail (n (\p. make
\
_list junk p) empty))) in
let leq = \m n. iszero(n pred m) in
let eq = \m n. and (leq m n)(leq n m) in
let leq = \m n. iszero(n pred m) in
let eq = \m n. and (leq m n)(leq n m) in
@@
-31,10
+31,10
@@
let Y = \f. (\h. f (h h)) (\h. f (h h)) in
let length = Y (\length l. isempty l 0 (succ (length (tail l)))) in
; synonyms
let length = Y (\length l. isempty l 0 (succ (length (tail l)))) in
; synonyms
-let makePair = make_pair in
+let makePair = make
\
_pair in
let nil = empty in
let isNil = isempty in
let nil = empty in
let isNil = isempty in
-let makeList = make_list in
+let makeList = make
\
_list in
let isZero = iszero in
let mult = mul in
let isZero = iszero in
let mult = mul in