- Cartesian Product A X B is the set of all ordered pairs (a,b) where a ∈ A and b ∈ B
- A function:
- For every input, there is some output
- Has one output at most for an input—vertical line testing could be done to test this

- A function F between A and B is a relation between A and B (subset of A X B)—define this using the Cartesian Product:
- For every element x ∈ A there is an element y ∈ b such that (x, y) ∈ F
- If (x, y) ∈ F and (x, z) ∈ F then y = z

- Two statements are logically equivalent if they have the same truth table
- p ≡ ~(~p) (p equals to not not p)
- DeMorgan's Laws

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