+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 lambda-calculus arithmetical and list operations, some relatively advanced.
+
+<!--
+ To play around with a **typed lambda calculus**, which we'll look at later
+ in the course, have a look at the [Penn Lambda Calculator](http://www.ling.upenn.edu/lambda/).
+ This requires installing Java, but provides a number of tools for evaluating
+ lambda expressions and other linguistic forms. (Mac users will most likely
+ already have Java installed.)
+
+We've sent around an email to those who left their email addresses on the roster we passed around. But it's clear that the roster didn't make its way to everyone. So if you're not receiving our seminar emails, please email <mailto:jim.pryor@nyu.edu> with your email address, and if you're a student, say whether you expect to audit or take the class for credit.
+-->
+
+
+## Lecture Notes and Assignments ##
+
+(13 Sept) Lecture notes for [[Week1]]; [[Assignment1]].
+
+Topics: Applications; 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
+
+(27 Sept) Lecture notes for [[Week3]]; [[Assignment3]].
+
+Topics: Recursion with Fixed Point Combinators
+
+(4 Oct) Lecture notes for Week 4
+
+<!-- Introducing the notion of a "continuation", which technique we'll now already have used a few times
+-->
+
+[[Upcoming topics]]
+
+
+##[[Offsite Reading]]##
+
+There's lots of links here already to tutorials and encyclopedia entries about many of the notions we'll be dealing with.
+
+
+
+## Course Overview ##