initial commit
removed ugly/broken Main.sc
Adding week 2 exercise file with tail recursive factorial function.
Adding Main.scala for Assignment 1 to the repository.  However, it won't
work from within the week1 package. It can be run from within the recfun
package in src/main/scala in the progfun-recfun module.  The code for
exercises 1 and 2 work.  The code for exercise 3 does not work yet.
Initial commit of exercises from Lecture 2.2
simply renaming for consistency
Initial commit of Lecture 2.3 exercise
minor mod
initial commit of Lecture 2.4--2.6 exercises
initial commit of Lecture 3.1 examples on Class Hierarchies
fixed comment
made Empty into an object instead of a class---only need one empty set!
Initial commit of Hello Scala program.
initial commit of scratch
initial commit of Rational class, Cons-List class, and nth element
function
added exercise from end of Lecture 4.1
initial commit of simple test of List.apply method
initial commit of Peano numbers exercise

constructing natural numbers without primitive types
initial commit of week 5 exercises
implemented pattern match on pairs (Lecture 5.2)