SP18:Lecture 5 Functions
- Reading: MCS 4.3 — 4.5
- This material was covered in lectures 2 (modeling problems) and 4 (functions) in 2017sp.
Proof techniques continues
- we often draw functions:
- another way to draw a function is with a table:
This almost describes a function; the domain is clearly (because if there were any other domain elements, would not be a function); and the rule is clear. However, the codomain is not clear: is it ? Or ? Or , or ? When describing a function with a table, the codomain should be specified somewhere.