Functions
Sources:
- Bernard Kolman, Robert C. Busby & Sharon Cutler Ros. (2014). Functions. Discrete Mathematical Structures (6th ed., pp. 206-246). Pearson.
- John Hubbard; Barbara Burke Hubbard. (2015). Vector calculus, linear algebra, and differential forms: A unified approach (5th ed., pp. 9-11). Matrix Editions.
In this section we define the notion of a function, a special type of relation.