## The Fundamental Ideas of Mathematics

Syllabus.

Day-by-day summary.

Record of assignments.

Solutions distributed in class.

The Greek alphabet.

Some brief tips on writing proofs.

Some longer tips on dealing with proofs.

An introductory example.

A basic fact about union and intersection.

Classwork: practice with unions and intersections of indexed sets.

Classwork on converse, contrapositive, and inverse.

Lincoln comes to Fundamentals class.

Assignment 7 classwork.

More on union and intersection of sets.

A proof of one of the basic properties of sets.

Handout on the Fundamental Theorem of Arithmetic.

Classwork: Using the FTA to count divisors.

Splitting nonconvex polygons.

Some graph theory terminology.

Constructing path "C" (flowchart).

Partitions and equivalence relations.

Classwork: practice with direct and inverse images of sets.

Some history of the concept of negative numbers.

A partition of (NxN).

Sizing infinite sets.