**Fall 2015**

**Homework**

The latest homework will always appear on top.

Homework **9** (the last homework is due on Wednesday Dec. 9, 2015. It consists of the the following exercises:

54.1, 54.2, 54.3, 54.4, 54.8.

55.1, 55.2, 55.5, 55.7.

56.1, 56.5.

**Suggested extra work**:

After 54.4, think about the width of the poset defined in 54.3 for any n (Hint: Consider n even and n odd separately).

54.9 is a very good exercise to get more practice with posets.

56.7 is "alphabetical" ordering in disguise (this ordering has the more technical name of "lexicographic ordering").

Solutions.

Homework **8** is due on Friday Dec. 4, 2015. It consists of cardinality problems

Homework 8

and problems 25.16 and 25.17.

Homework 8 Solutions.

Homework **7** is due on Wednesday November 18, 2015:

25.2, 25.6, 25.7, 25.9, 25.13,

26.7, 26.9, 26.10.

Also do 26.1 to practice.

Solutions.

Homework **6** is due on Wednesday November 11, 2015:

24.1, 24.2, 24.5, 24.6, 24.8, 24.14, 24.16, 24.17, 24.20.

Solutions.

Homework **5** is due on Monday November 2, 2015:

22.16, 22.17

20.4, 20.5, 20.9, 20.10, 20.13.

21.3, 21.7, 21.9.

Solutions.

Homework **4** is due on Monday October 12, 2015 (well the quiz for it will be then):

Read Sections 17 and 22.

17.3, 17.4, 17.5, 17.8, 17.11, 17.16, 17.21, 17.37.

22.4, 22.5, 22.6, 22.7.

Solutions.

Homework **3** is due on Wednesday September 30, 2015 (well the quiz for it will be then):

Read Sections 14, 15 and 16.

14.1, 14.3 (no need to prove here), 14.5, 14.6, 14.10, 14.17 (proofs required in 14.6 and 14.10).

15.1, 15.3 (no proof required here), 15.7, 15.8, 15.14, 15.15.

16.1, 16.10, 16.15.

Solutions.

Homework **2** consists of the following exercises. A quiz selecting 2 or 3 of these exercises will be given on Wednesday September 16, 2015:

8.2, 8.4, 8.8, 8.10, 8.15.

9.2, 9.5, 9.7, 9.9, 9.11.

10.1, 10.4, 10.9, 10.12, 10.13.

11.1, 11.2, 11.4, 11.7.

12.1, 12.5, 12.9, 12.12, 12.21, 12.24, 12.30.

Homework 2 Solutions.

Solutions to 10.12 and 10.13.

Homework **1** consists of the following exercises. A quiz selecting 2 or 3 of these exercises will be given on Friday September 4, 2015:

3.1, 3.4, 3.5, 3.7, 3.12, 3.13

4.1, 4.2 and 4.7.

5.1, 5.7, 5.11, 5.18, 5.23

6.1, 6.3, 6.6, 6.9 and 6.13.

7.1, 7.6, 7.10, 7.11, 7.13, 7.17.

Homework 1 Solutions.