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@@ 2,108 +2,68 @@
or: **What Philosophers and Linguists Can Learn From Theoretical Computer Science But Didn't Know To Ask**
This course will be cotaught by [Chris Barker](http://homepages.nyu.edu/~cb125/) and [Jim Pryor](http://www.jimpryor.net/). Linguistics calls it "G61.3340002" and Philosophy calls it "G83.2296001."

+This course is cotaught by [Chris Barker](http://homepages.nyu.edu/~cb125/) and [Jim Pryor](http://www.jimpryor.net/). Linguistics calls it "G61.3340002" and Philosophy calls it "G83.2296001."
+The seminar meets on Mondays from 46, in
+the Linguistics building at 10 Washington Place, in room 104 (back of the first floor).
+One student session will be held every Wednesday from 34 on the
+fourth floor at 10 Washington Place.
## Announcements ##
* The seminar meets on Mondays from 46, in
the Linguistics building at 10 Washington Place, in room 104 (back of the first floor).


+* This is the time of the semester when some people start slipping
+ behind with the homework. Don't.
* One student session will be held every Wednesday from 34. The other will
be arranged to fit the schedule of those who'd like to attend but can't
make the Wednesday time. (We first proposed Tuesdays from 1112, but this
time turns out not to be so helpful.) If you're one of the students who
wants to meet for Q&A at some other time in the week, let us know.
+[[Older Announcements]]
 You should see the student sessions as opportunities to clear up lingering
issues from material we've discussed, and help get a better footing for what
we'll be doing the next week. It would be smart to make a serious start on that
week's homework, for instance, before the session.
+##[[Lambda Evaluator]]##
* There is now a [[lambda evaluator]] you can use in your browser (no need to
install any software). It can help you check whether your answer to some of the
homework questions works correctly.
+Usable in your browser. It can help you check whether your answer to some of
+the homework questions works correctly.
 There is also now a [library](/lambda_library) of lambdacalculus
+There is also now a [library](/lambda_library) of lambdacalculus
arithmetical and list operations, some relatively advanced.
 An evaluator with the definitions used for homework 3
preloaded is available at [[assignment 3 evaluator]].

* Henceforth, unless we say otherwise, every homework will be "due" by
Sunday morning after the Monday seminar in which we refer to it.
(Usually we'll post the assignment shortly before the seminar, but don't
rely on this.) However, for every assignment there will be a "grace
period" of one further week for you to continue working on it if you
have trouble and aren't able to complete the assignment to your
satisfaction by the due date. You shouldn't hesitate to talk to usor
each other!about the assignments when you do have trouble. We don't
mind so much if you come across answers to the assignment when browsing
the web, or the Little Schemer book, or anywhere. So long as you can
reason yourself through the solutions and experience for yourself the
insights they embody.

 We reserve the privilege to ruthlessly require you to
explain your solutions in conversations at any point, in section or in
class.

 You should always *aim* to complete the assignments by the "due" date,
as this will fit best with the progress of the seminar. Let's take
assignment 3 to be "due" on Sunday Oct 3 (the date of this
announcement), but as we announced last week in seminar, you can take up
until this coming Sunday to complete it. If you need to. Try to complete
it, and get assistance completing it if you need it, sooner.

* We'll shortly be posting another assignment, assignment 4, which will be
"due" on the Sunday before our next seminar. That is, on Sunday Oct 17.
(There's no seminar this coming Monday.)

 The assignments will tend to be quite challenging. Again, you should by
all means talk amongst yourselves, and to us, about strategies and
questions that come up when working through them.

 We will not always be able to predict accurately which problems are
easy and which are hard. If we misjudge, and choose a problem that is
too hard for you to complete to your own satisfaction, it is still
very much worthwhile (and very much appreciated) if you would explain
what is difficult, what you tried, why what you tried didn't work, and
what you think you need in order to solve the problem.





## Lecture Notes and Assignments ##
(13 Sept) Lecture notes for [[Week1]]; [[Assignment1]].
Topics: Applications; Basics of Lambda Calculus; Comparing Different Languages
+> Topics: [[Applications]], including [[Damn]]; Basics of Lambda Calculus; Comparing Different Languages
(20 Sept) Lecture notes for [[Week2]]; [[Assignment2]].
Topics: Reduction and Convertibility; Combinators; Evaluation Strategies and Normalization; Decidability; Lists and Numbers
+> Topics: Reduction and Convertibility; Combinators; Evaluation Strategies and Normalization; Decidability; [[Lists and Numbers]]
+
+(27 Sept) Lecture notes for [[Week3]]; [[Assignment3]];
+an evaluator with the definitions used for homework 3
+preloaded is available at [[assignment 3 evaluator]].
(27 Sept) Lecture notes for [[Week3]]; [[Assignment3]].
+> Topics: [[Evaluation Order]]; Recursion with Fixed Point Combinators
Topics: Recursion with Fixed Point Combinators
+(4 Oct) Lecture notes for [[Week4]]; [[Assignment4]].
(4 Oct) Lecture notes for Week 4
+> Topics: More on Fixed Points; Sets; Aborting List Traversals; [[Implementing Trees]]
+
+
+(18 Oct, 25 Oct) Lecture notes for [[Week5]] and [[Week6]]; [[Assignment5]].
+
+> Topics: Types, Polymorphism

[[Upcoming topics]]
+[Advanced Lambda Calculus Topics](/advanced_lambda)
+
+> Topics: Version 4 lists
+
+##Scheme and OCaml##
+
+See [below](#installing) for how to get the programming languages running on your computer.
+
+* Links for help [[learning Scheme]]
+
+* Links for help [[learning OCaml]]
+
##[[Offsite Reading]]##
@@ 238,6 +198,7 @@ other. But these languages also have a lot in common, and if you're
familiar with one of them, it's not difficult to move between it and the
other.
+
[[How to get the programming languages running on your computer]]
[[Family tree of functional programming languages]]
@@ 249,15 +210,16 @@ It's not necessary to purchase these for the class. But they are good ways to ge
* *An Introduction to Lambda Calculi for Computer Scientists*, by Chris
Hankin, currently $17 on
[Amazon](http://www.amazon.com/IntroductionLambdaCalculiComputerScientists/dp/0954300653).
+[Amazon](http://www.amazon.com/dp/0954300653).
* (Another good book covering the same ground as the Hankin book, but
more thoroughly, and in a more mathematical style, is *LambdaCalculus and Combinators:
an Introduction*, by J. Roger Hindley and Jonathan P. Seldin. If you choose to read
+an Introduction*, by J. Roger Hindley and Jonathan P. Seldin, currently $52 on [Amazon](http://www.amazon.com/dp/0521898854). If you choose to read
both the Hankin book and this book, you'll notice the authors made some different
terminological/notational choices. At first, this makes comprehension slightly slower,
but in the long run it's helpful because it makes the arbitrariness of those choices more salient.)
+* (Another good book, covering some of the same ground as the previous two, but also delving much deeper into typed lambda calculi, is *Types and Programming Languages*, by Benjamin Pierce, currently $61 on [Amazon](http://www.amazon.com/dp/0262162091). This book has many examples in OCaml.)
* *The Little Schemer, Fourth Edition*, by Daniel P. Friedman and Matthias
Felleisen, currently $23 on [Amazon](http://www.amazon.com/exec/obidos/ASIN/0262560992).
@@ 286,5 +248,4 @@ All wikis are supposed to have a [[SandBox]], so this one does too.
This wiki is powered by [[ikiwiki]].
[[Test]]