《Discrete Mathematics with Applications》读书笔记（第3章）

Chapter3 Elementary Number Theory and Methods of proof

This chapter primarily addresses the issue concerning the validity and falsifiability within the realm of mathematics.

3.1 Direct Proof and Counterexample I: Introduction

Definitions

Composite number is defined as an integer divisible by one or more numbers other than the number itself and 1.

The two definition are negations of each ot