math 5

Discrete Mathematics

Readings Check section 5.2

Read Section 5.2, pages 252 ( 258.

Type in the answers below each question and email the completed document to me, or print out the document and fill it out by hand and email a scan or photo of it to me.

1) What is a function and how does it differ from a relation?

2) In example 5.9 why are R1 and R2 not functions? (Give an answer for each.)

3) Reading definition 5.4, how does the codomain of f differ from the range of f ?

4) What is the value of (4.25( ? What is the value of (4.25( ?

5) Suppose that |A| = 5 and |B| = 20. How many functions can possibly be made from A to B ? [see p. 255]

6) When is a function f : A ( B called one(to(one?

7) Again if |A| = 6 and |B| = 10, what is the number of one(to(one functions from A to B ?

After submitting this form, go on to watch the videos, read the notes, and start the homework assignment for section 5.2. Ask any questions that arise at any point in the process. When the homework assignment is done, and you feel that you have a solid understanding of the homework and the section, then take the quiz for section 5.2.