2.1 Sets
  - Definition
  - Example: N, Z, R
  - Property: unordered, size, equal, subset, power set
2.2 Set Operations
  - Union, intersect, complement
  - Venn diagram, set identities like De Morgan's law
  - Generalized union and intersection
2.3 Functions
  - Definition
  - Example and Graph: f(x)=x, x*x, floor(x)
  - One to one, onto, one to one correspondence
2.4 Sequences
  - Definition
  - Example: arithmetic and geometric sequences, Fibonacci
  - Summation
2.5 Cardinality of Sets
  - Finite, countable, uncountable
  - Proof that the set of real numbers is not countable