Class 2: Structures underlying evaluation

This class will be held in the location of our labs, MI 302.

Slides

These readings are not required; however, they will be very useful to review this material and/or gain more depth.

SICP: Section 2.2 and Section 2.3.
PLP: Sections 10.3.2 and 10.3.5. You can also go back and read Sections 10.1 and 10.2 for an overview of some topics covered in the first lecture.

These exercises are to be turned in in a single file called ex.scm in a folder called class02, using the submit program as in labs.

Write a function called my-append which has the same behavior as the append function built-in to Scheme. (Your function only has to handle the case when there are exactly two arguments, and both are lists.)
Write a function called count-down which takes a (positive) integer n and produces a list with integers from n down to 1, in that order.
So for instance (count-down 4) should produce the list (4 3 2 1).