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@@ 2,56 +2,93 @@
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."


## Announcements ##

+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.
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.

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.
+## Announcements ##
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.
+* This is the time of the semester when some people start slipping
+ behind with the homework. Don't.
There is now a [library](/lambda_library) of lambdacalculus arithmetical and list operations, some relatively advanced.
+[[Older Announcements]]
There's also a page of [advanced challenges and techniques](/lambda_advanced) for the untyped lambdacalculus.
+##[[Lambda Evaluator]]##
+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
+arithmetical and list operations, some relatively advanced.
## 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]].
+(27 Sept) Lecture notes for [[Week3]]; [[Assignment3]];
+an evaluator with the definitions used for homework 3
+preloaded is available at [[assignment 3 evaluator]].
Topics: Recursion with Fixed Point Combinators
+> Topics: [[Evaluation Order]]; Recursion with Fixed Point Combinators
(4 Oct) Lecture notes for Week 4
+(4 Oct) Lecture notes for [[Week4]]; [[Assignment4]].

+> 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, Unit and Bottom
+
+(1 Nov) Lecture notes for [[Week7]]; [[Assignment6]].
+
+> Topics: Monads; [[Reader Monad for Variable Binding]]; [[Reader Monad for Intensionality]]
+
+(8 Nov) Lecture notes for [[Week8]].
+
+> Topics: Reader Monad for Jacobson's VariableFree Semantics
+
+(15 Nov) Lecture notes for [[Week9]]; [[Assignment7]]. Everyone auditing in the class is encouraged to do this assignment, or at least work through the substantial "hints".
+
+> Topics: Mutable Variables; Passing by Reference
+
+(22 Nov) Lecture notes for [[Week10]]
+
+> Topics: Calculator Improvements, including mutation
+
+(30 Nov) Lecture notes for [[Week11]]; [[Assignment8]].
+
+> Topics: [[Tree and List Zippers]]; [[Coroutines and Aborts]]; [[From List Zippers to Continuations]].
+
+(6 Dec) Lecture notes for [[Week12]]
+
+> Topics: [[List Monad as Continuation Monad]]; [[Manipulating Trees with Monads]]; ...
+
+(13 Dec) Lecture notes for Week13
[[Upcoming topics]]
+[[Advanced Topics]]
+
+> Topics: Version 4 lists, Monads in Category Theory, Calculator Improvements
+
+##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]]##
@@ 186,6 +223,7 @@ 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]]
@@ 197,15 +235,16 @@ 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).
@@ 234,5 +273,4 @@ All wikis are supposed to have a [[SandBox]], so this one does too.
This wiki is powered by [[ikiwiki]].
[[Test]]