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@@ 7,21 +7,72 @@ This course will be cotaught by [Chris Barker](http://homepages.nyu.edu/~cb125/
## Announcements ##
The seminar meets on Mondays from 46, in
+* 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. 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.

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.

There is now a [library](/lambda_library) of lambdacalculus arithmetical and list operations, some relatively advanced.

There's also a page of [[miscellaneous lambda challenges and advanced topics]].


+
+
+* 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.
+
+* 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.
+
+ 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 on Monday Oct 11.)
+
+ 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.
+
+
+> Topics: More on Fixed Points; Sets; Aborting List Traversals; [[Implementing Trees]]
+
+
+(18 Oct) Lecture notes for Week 5
+
+> Topics: Types, Polymorphism
[[Upcoming topics]]
+[Advanced Lambda Calculus Topics](/advanced_lambda)
+
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