XGitUrl: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=blobdiff_plain;f=week2.mdwn;h=49a7e8d5af7632592a80b80b6351058bb97c1a7c;hp=b1867025c80591efbbdadb603e8f85a8e17aedac;hb=76d2b904ae8af78f5d69fd1580f7f2a2cbfe6095;hpb=e81c56d0aef56e3d24c5592d64888d9041bc5caf
diff git a/week2.mdwn b/week2.mdwn
index b1867025..49a7e8d5 100644
 a/week2.mdwn
+++ b/week2.mdwn
@@ 56,20 +56,20 @@ In a bit, we'll discuss other systems that lack variables. Those systems will no
Syntactic equality, reduction, convertibility
=============================================
Define T to be `(\x. x y) z`. Then T and `(\x. x y) z` are syntactically equal, and we're counting them as syntactically equal to `(\z. z y) z` as well, which we will write as:
+Define N to be `(\x. x y) z`. Then N and `(\x. x y) z` are syntactically equal, and we're counting them as syntactically equal to `(\z. z y) z` as well, which we will write as:
T ≡ (\x. x y) z ≡ (\z. z y) z
+N ≡ (\x. x y) z ≡ (\z. z y) z
This:
 T ~~> z y
+ N ~~> z y
means that T betareduces to `z y`. This:
+means that N betareduces to `z y`. This:
 M <~~> T
+ M <~~> N
means that M and T are betaconvertible, that is, that there's something they both reduce to in zero or more steps.
+means that M and N are betaconvertible, that is, that there's something they both reduce to in zero or more steps.
Combinators and Combinatorial Logic
===================================
@@ 101,9 +101,8 @@ One can do that with a very spare set of basic combinators. These days the stand
There are some wellknown linguistic applications of Combinatory
Logic, due to Anna Szabolcsi, Mark Steedman, and Pauline Jacobson.
Szabolcsi supposed that the meanings of certain expressions could be
insightfully expressed in the form of combinators.

+They claim that natural language semantics is a combinatory system: that every
+natural language denotation is a combinator.
For instance, Szabolcsi argues that reflexive pronouns are argument
duplicators.
@@ 111,7 +110,7 @@ duplicators.
![reflexive](http://lambda.jimpryor.net/szabolcsireflexive.jpg)
Notice that the semantic value of *himself* is exactly `W`.
The reflexive pronoun in direct object position combines first with the transitive verb (through compositional magic we won't go into here). The result is an intransitive verb phrase that takes a subject argument, duplicates that argument, and feeds the two copies to the transitive verb meaning.
+The reflexive pronoun in direct object position combines with the transitive verb. The result is an intransitive verb phrase that takes a subject argument, duplicates that argument, and feeds the two copies to the transitive verb meaning.
Note that `W <~~> S(CI)`:
@@ 141,7 +140,7 @@ The reduction rule for K is also straightforward:
That is, K throws away its second argument. The reduction rule for S can be constructed by examining
the defining lambda term:
 S = \fgx.fx(gx)
+S ≡ \fgx.fx(gx)
S takes three arguments, duplicates the third argument, and feeds one copy to the first argument and the second copy to the second argument. So:
@@ 183,25 +182,28 @@ The fifth rule deals with an abstract whose body is an application: the S combin
[Fussy notes: if the original lambda term has free variables in it, so will the combinatory logic translation. Feel free to worry about this, though you should be confident that it makes sense. You should also convince yourself that if the original lambda term contains no free variablesi.e., is a combinatorthen the translation will consist only of S, K, and I (plus parentheses). One other detail: this translation algorithm builds expressions that combine lambdas with combinators. For instance, the translation of our boolean false `\x.\y.y` is `[\x[\y.y]] = [\x.I] = KI`. In the intermediate stage, we have `\x.I`, which mixes combinators in the body of a lambda abstract. It's possible to avoid this if you want to, but it takes some careful thought. See, e.g., Barendregt 1984, page 156.]
+[Various, slightly differing translation schemes from combinatorial logic to the lambda calculus are also possible. These generate different metatheoretical correspondences between the two calculii. Consult Hindley and Seldin for details. Also, note that the combinatorial proof theory needs to be strengthened with axioms beyond anything we've here described in order to make [M] convertible with [N] whenever the original lambdaterms M and N are convertible.]
+
+
Let's check that the translation of the false boolean behaves as expected by feeding it two arbitrary arguments:
KIXY ~~> IY ~~> Y
Throws away the first argument, returns the second argumentyep, it works.
Here's a more elaborate example of the translation. The goal is to establish that combinators can reverse order, so we use the T combinator, where `T = \x\y.yx`:
+Here's a more elaborate example of the translation. The goal is to establish that combinators can reverse order, so we use the **T** combinator, where T ≡ \x\y.yx
:
[\x\y.yx] = [\x[\y.yx]] = [\x.S[\y.y][\y.x]] = [\x.(SI)(Kx)] = S[\x.SI][\x.Kx] = S(K(SI))(S[\x.K][\x.x]) = S(K(SI))(S(KK)I)
We can test this translation by seeing if it behaves like the original lambda term does.
The orginal lambda term lifts its first argument (think of it as reversing the order of its two arguments):
 S(K(SI))(S(KK)I) X Y =
 (K(SI))X ((S(KK)I) X) Y =
 SI ((KK)X (IX)) Y =
 SI (KX) Y =
 IY (KX)Y =
 Y X
+ S(K(SI))(S(KK)I) X Y ~~>
+ (K(SI))X ((S(KK)I) X) Y ~~>
+ SI ((KK)X (IX)) Y ~~>
+ SI (KX) Y ~~>
+ IY (KXY) ~~>
+ Y X
Voilà: the combinator takes any X and Y as arguments, and returns Y applied to X.
@@ 241,7 +243,7 @@ in two books in the 1990's.
A final linguistic application: Steedman's Combinatory Categorial Grammar, where the "Combinatory" is
from combinatory logic (see especially his 2000 book, The Syntactic Processs). Steedman attempts to build
a syntax/semantics interface using a small number of combinators, including T = `\xy.yx`, B = `\fxy.f(xy)`,
+a syntax/semantics interface using a small number of combinators, including T ≡ `\xy.yx`, B ≡ `\fxy.f(xy)`,
and our friend S. Steedman used Smullyan's fanciful bird
names for the combinators, Thrush, Bluebird, and Starling.
@@ 318,20 +320,24 @@ will etareduce by n steps to:
\x. M
+When we add etareduction to our proof system, we end up reconstruing the meaning of `~~>` and `<~~>` and "normal form", all in terms that permit etareduction as well. Sometimes these expressions will be annotated to indicate whether only betareduction is allowed (~~>_{β}
) or whether both beta and etareduction is allowed (~~>_{βη}
).
+
The logical system you get when etareduction is added to the proof system has the following property:
> if `M`, `N` are normal forms with no free variables, then M ≡ N
iff `M` and `N` behave the same with respect to every possible sequence of arguments.
That is, when `M` and `N` are (closed normal forms that are) syntactically distinct, there will always be some sequences of arguments L_{1}, ..., L_{n}
such that:
+This implies that, when `M` and `N` are (closed normal forms that are) syntactically distinct, there will always be some sequences of arguments L_{1}, ..., L_{n}
such that:
M L_{1} ... L_{n} x y ~~> x
N L_{1} ... L_{n} x y ~~> y
That is, closed normal forms that are not just betareduced but also fully etareduced, will be syntactically different iff they yield different values for some arguments. That is, iff their extensions differ.
+So closed betaplusetanormal forms will be syntactically different iff they yield different values for some arguments. That is, iff their extensions differ.
So the proof theory with etareduction added is called "extensional," because its notion of normal form makes syntactic identity of closed normal forms coincide with extensional equivalence.
+See Hindley and Seldin, Chapters 78 and 14, for discussion of what should count as capturing the "extensionality" of these systems, and some outstanding issues.
+
The evaluation strategy which answers Q1 by saying "reduce arguments first" is known as **callbyvalue**. The evaluation strategy which answers Q1 by saying "substitute arguments in unreduced" is known as **callbyname** or **callbyneed** (the difference between these has to do with efficiency, not semantics).
@@ 430,6 +436,7 @@ But is there any method for doing this in generalfor telling, of any given co
* [Scooping the Loop Snooper](http://www.cl.cam.ac.uk/teaching/0910/CompTheory/scooping.pdf), a proof of the undecidability of the halting problem in the style of Dr Seuss by Geoffrey K. Pullum
+Interestingly, Church also set up an association between the lambda calculus and firstorder predicate logic, such that, for arbitrary lambda formulas `M` and `N`, some formula would be provable in predicate logic iff `M` and `N` were convertible. So since the righthand side is not decidable, questions of provability in firstorder predicate logic must not be decidable either. This was the first proof of the undecidability of firstorder predicate logic.
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