## Homework Hints 2-4

[tippy title=”Problems 1-4″]Problems 1-4
There are many problems throughout the text labeled IN YOUR OWN WORDS. Just relax; do not be afraid to give your opinion. For the most part, these questions do not have “right” or “wrong” answers. Several … See the whole entry

## 2.4 Outline

1. Infinite sets
1. finite
2. infinite
3. one-to-one
4. correspondence
5. countable/uncountable
1. rational numbers are countable
2. real numbers are uncountable
2. Cartesian product of sets
1. definition
2. cardinality of a Cartesian product
3. fundamental counting principle

## 2.4 Essential Ideas

One-to-one Correspondence

Two sets A and BSee the whole entry

## 2.2 Outline

1. Fundamental operations
1. intersection; “and”
2. union; “or”
2. Cardinality of intersections and union
1. Venn diagram for union
2. Formula

## 2.2 Essential Ideas

Operations with Sets

Remember the basic operations:

Complement

The complement of a set S is consists of everything that … See the whole entry