Marie J. Weiss, "Higher Algebra for the Undergraduate"

Ch. 1 The Integers

1 The positive integers
   Exercises
2 Further properties
3 Finite induction
   Exercises
4 Summary
5 The integers
6 The number zero
7 The positive integers as a subset of the integers
8 The negative integers
   Exercises
9 Inequalities
   Exercises
10 Division of integers
     Exercises
11 Greatest common divisor
     Exercises
12 Prime factors
     Exercises
13 Congruences
     Exercises
14 The linear congruence
     Exercises
15 Residue classes
     Exercises
16 Positional notation for integers
     Exercises