• 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