General Information:
Meeting Time:  MWF 9  9:50 
Location:  Jones 306

Instructor:  Ryan Vinroot
Office: Jones 130
Office Hours: Mon 1012 and Wed 1011, 1:302:30 (appointments are also OK, although I am not
available on Tues/Thurs)

Textbook:  Applied Combinatorics, Sixth Edition, by
Alan Tucker 
Grade Breakdown:  Class Participation  5%, Midterm  30%, Homework  35%, Final Exam  30%. The
grading scale will be the standard 10 percentage point scale, so that a final
score of 93 or higher is an A, 9092 is an A, 8789 is a B+, 8386 is a
B, 8082 is a B, etc. 
Attendance & Lecture Policy:  It is expected that you attend all
lectures, with exceptions minimized. It is greatly appreciated when you
are on time. Please do your best to stay awake and attentive during
lecture, please do not email or text during lecture, and keep all cell
phones/hand held devices/laptops put away during lecture. While it is
understandable that you may miss a lecture here and there, or be sleepy in
class once in awhile, repeated absences, late arrivals, naps, or general
nonattentiveness will negatively affect your class participation score.

Prerequisites:  Math 214  Foundations of Mathematics, and Math
211  Linear Algebra. Also, as this is a 400level class, it will be
assumed that you are comfortable with mathematical proofs beyond the level
of Math 214. In particular, I will lecture with the assumption that
everyone has had either Math 307 or Math 311, although there is no specific
material from these courses that will be needed for this one. 

Syllabus:
Combinatorics is a difficult subject to define, as it is extremely broad. The
goal of the course will be to introduce you to two major topics in
combinatorics: graph theory and enumerative combinatorics. Both of these
topics may be applied in numerous areas, some of which are mentioned in the
textbook, although we will concentrate on developing the theory behind these
topics.
We will begin by covering Chapters 1 and 2 of the textbook, which gives an
overview of some of the main topics in graph theory. Following Chapters 1 and
2, we will then cover Chapter 5, which is an introduction to
enumeration. Many of you may have seen some of this material in a statistics
or probability course, or some other course, although we will try to understand
this material from a new point of view. After the introductory chapter on
enumeration, we will then return to graph theory, and cover a few topics
on trees and algorithms in Sections 3.1, 3.2, 4.1, and 4.2. Finally, we will
return to enumeration, centered around the idea of generating functions in
Chapter 6. We will then cover some sections in Chapter 7 on recurrences,
inclusionexclusion in Sections 8.1, 8.2, as well as some
interesting topics not in the text, as time permits.
Dates & Course Announcements:
Midterm and Final Exams:
The midterm will be a takehome exam, and will cover Chapters 1, 2, and 5. You
will have one week to complete it, and you will be given the midterm whenever
we finish Chapter 5 (which will likely be either just before or just after
Spring Break).
The final exam will be cummulative, and will consist of a takehome portion as
well as a timed portion. Our final exam is scheduled for the very first time
slot, and so you will be given the takehome portion one week prior, it will only
cover material up to that point, and it will be due at the start time of the
final exam slot. There will be a short timed portion of the final exam given
during the final exam time slot as well, consisting of true/false and short
answer/calculation problems.
Exam Calendar (Tentative):
Midterm 
Week of Mar 17 
TBA 
TBA

Final Exam 
Mon, Apr 28 
912 
TBA

 All relevant announcements will be listed here. Check back frequently (don't forget
to refresh your browser) for updates.
 Important Dates and Class Holidays:
 Mon, Jan 20: NO CLASS (MLK, Jr Day)
 Mon, Jan 27: ADD/DROP DEADLINE
 Sat, Mar 1  Sun, Mar 9: NO CLASS (Spring Break)
 Fri, Mar 14: WITHDRAW DEADLINE
 Mon, Apr 28, 9:00  12:00  FINAL EXAM
 (1/24) Because of the snow day on Wednesday, the first homework is now due
on Mon, Jan 27. I will have office hours today (Fri, Jan 24), 1012 and 24
for any questions about the homework or class.
 (2/3) I have now set my regular weekly office hours: Mon 1012 and Wed
1011, 1:302:30.
 (4/16) I will have extra office hours today. My hours will be: 1011,
1:303, 45.
 (4/23) My office hours today (Wed, Apr 23) will be 1011 (regular) and 12
(shifted back 30 min). I will have extra office hours tomorrow (Thurs,
Apr 24) 9 AM12 Noon.
Homework:
As is the case with all of mathematics, the only way to learn it well is to do
as many problems as possible. So, homework problems will be a very important
part of the course, and there will be homework assigned almost every week (other than
the week of the midterm/final). Completion of all homework problems is required, and your
grade on a homework assignment will be based on completeness, as well as on the
details of the solutions of the problems graded. In particular, I will not
necessarily grade every homework problem assigned, but part of your score for an
assignment will be for the completion of all problems. Working with classmates
on homework is a delicate topic: it is allowed, as long as this is limited to
collaborative discussion (and not someone simply telling you the solution).
This is restricted to discussion only, and individual homework
assignments should be completed by the student alone after such discussions
take place. I am always open
for questions, either in office hours or by email. You should not, under any
circumstances, attempt to look up solutions or hints to problems online. I
will consider this plagiarism, an honor offense.
For each homework problem assigned, a complete solution with each step
explained should be written up clearly and neatly. Be sure to completely explain your steps and reasoning
for calculations as well as for proofs. This is especially important in
enumerative problems, as there can be many ways to arrive at the same answer,
and what I am interested in is your thought process. When you are in doubt
whether you should explain something, then explain it. If you are tempted to
use words like "clearly" or "obviously", then instead explain the statement in
a short sentence.
Homework is due at the beginning of
class on the due date of the assignment, which will almost always be on a
Friday. Late homework will be marked off 10% if it is turned in after the
beginning of class, but by 5 on the due date. It will be marked 20% off if I
have it by the beginning of class (or 9 AM) on the following weekday, and 20% off for
each day after (with 9 AM being the cutoff time for that day). Everything
is easier, of course, if you turn in the homework on time!
Assignment 
Problems 
Due Date 
1  Sec. 1.1 #3, 7, 18, Sec. 1.2 #5(a)(d), #6(a)(d)

Mon, Jan 27 
2  Sec. 1.2 #14, Sec. 1.3 #3, 4, 6, 9

Fri, Jan 31 
3  Sec. 1.3 #16, Sec. 1.4 #8, 9, 12, 13, 14, 20

Fri, Feb 7 
4  Sec. 1.4 #27(b,c), Sec. 2.1 #2, 3, 12(a,c) Sec. 2.2 #4(b,d)

Fri, Feb 14 
5  Sec. 2.2 #6, Sec. 2.3 #1(f,h,j) Sec. 2.4 #1, 2, 11(a,b,c)

Fri, Feb 21 
6  Sec. 5.1 #18, 28, Sec. 5.2 #36, 42, 67, Sec. 5.3 #14, 19
For 5.3 #14, Assume that mixed partial derivatives do not depend on order.

Fri, Feb 28 
7  Sec. 5.4 #18, 40, Sec. 5.5 #14(d,f), 23, 26, 32

Fri, Mar 14 
8  Sec. 3.1 #4, Sec. 3.2 #2, Sec. 6.1 #2(c,e), 17, 20

Fri, Mar 28 
9  Sec. 6.2 #18, 27, Sec. 6.3 #2, 11, 15 Sec. 7.1 #6, Sec. 7.2 #7

Fri, Apr 4 
10  Sec. 7.3 #3(b,d), 7, Sec. 7.4 #6, 9(b,c), 10 Sec. 6.5
#1(d,e), 2(d,e)

Fri, Apr 11 
11  Sec. 7.5 #1(c,d), 2(for #1c,d), Sec. 8.1 #20, Sec. 8.2 #10, 25, 39

Fri, Apr 18 
Math Major Writing Requirement (Math 300):
If you are a math major, and you would like to complete your major writing
requirement through a writing assignment in this class, please let me know in
the first week of class and we will discuss it. This writing assignment will not count towards your
grade in this class, but will rather just serve as your Major Writing
Requirement. If you decide to do this, you must write your paper on a topic in
Combinatorics approved by me, and you must keep to a schedule of turning in
drafts that is set at the beginning of the semester in order to get credit.
