- Sequences and Summations (Rosen 2.4)
- sequences, how to express them {a_n}
- sums (big sigma), geometric progressions, how to simplify them
- products (big pie)
- Cardinality: countable and uncountable sets, leading to incomputability
- The Integers and Division (Rosen 3.4 and 3.5)
- division, divisibility
- prime numbers and the Fundamental Theorem of Arithmetic
- the division algorithm
- gcd and lcm
- relative primes
- modular arithmetic