21110: Problem Solving in Recreational Mathematics, spring 2010
Location 
Porter Hall A22 
Time 
Mondays, Wednesdays, and Fridays, 1:30–2:20 p.m. 
Textbooks 
 Problem Solving Through Recreational
Mathematics, by Bonnie Averbach and Orin Chein,
ISBN 0486409171
 Thinking Mathematically, by John Mason,
Leone Burton, and Kaye Stacey, ISBN 0201102382

Instructor 
Brian Kell
<bkell@cmu.edu>
Physical Plant Building 342
4122681447 
Office hours 
 Monday 2:30–4:00 p.m.
 Wednesday 2:30–4:00 p.m.
Other times are available by appointment. Please refer to my
typical
weekly schedule.

Calendar
The calendar describes what we did each day and
has links to all of the various documents (homework assignments, handouts, and
so forth). For a broad overview of the kinds of things we might cover in this
course, please see the list of potential topics.
Course documents and handouts
Homework assignments
 Homework assignment 1 (PDF,
TeX): assigned Wednesday, January 13;
due Wednesday, January 20.
 Homework assignment 2 (PDF,
TeX): assigned Monday, January 25;
due Wednesday, February 3 (note the change).
 Homework assignment 3 (PDF,
TeX; MetaPost
drawings: one point,
two points,
three points,
four points,
five points): assigned Friday,
February 5; due Wednesday, February 17 (note the
change).
 Hints for problem 7: It may be helpful to
find a formula for a sequence of numbers;
when n = 10, the number of regions is 256
(you can use this to check your formula); be sure to draw your points
so that no three chords intersect in a single point.
 Solutions: PDF,
source files.
 Homework assignment 4 (PDF,
TeX; MetaPost
drawing: sheep pen):
assigned Friday, February 19; due Friday, February 26 (though
turning it in on Monday, March 1 is fine).
 Homework assignment 5 (PDF,
TeX): assigned Monday, March 15; due
Wednesday, March 24.
 Homework assignment 6
(PDF, TeX;
MetaPost drawings:
streets,
chords): assigned Friday,
March 26; due Monday, April 5.
 Homework assignment 7
(PDF, TeX):
assigned Monday, April 5; due Wednesday, April 14.
 Homework assignment 8
(PDF, TeX;
Paraguay,
United States;
MetaPost drawing:
multigraph):
assigned Wednesday, April 14; due Monday, April 26.
 Homework assignment 9
(PDF, TeX):
assigned Wednesday, April 14; due Friday, April 30.
Project
The project was assigned on Wednesday, March 17. It is due on the last
day of class. See the project handout for more
details. If you would like to do something other than (or in addition to) the
suggestions in the handout, please come talk to me. When you have decided on a
project group, please email me to let me
know.
Challenge questions
Feedback
I am always interested to get feedback about this course: questions,
comments, complaints, and suggestions. You are certainly welcome to talk to me
directly. Otherwise, you can email me,
deliver a note for me to the Mathematical Sciences department office in Wean
Hall 6113, or slip a note under my office door (PPB 342; make sure
you mark the note with my name, since I have several officemates).
Last updated 4 May 2010.
Brian Kell
<bkell@cmu.edu>