## Past Presentations

**Spring 202**2

- Mar 6: Silas Johnson, ARML Power Contest
- Mar 13: Martha Precup, Graph theory and Ramsey numbers
- Mar 20: Shuhao Cao, Mathematics and Logic through Puzzles
- Mar 27: Xiang Tang, How to calculate $\pi$?

**Fall 2021**

- Oct 17: Karl Schaefer, Tic-Tac-No! Strategy and Symmetry
- Oct 24: Jeet Sampat, An introduction to Sudoku and its different variants
- Oct 31: Ben Wormleighton, Patterns from cluster algebras
- Nov 7: Silas Johnson, ARML Power Contest
- Nov 14: Shuhao Cao, The game of Go, the most mathematical game human ever invented
- Nov 21: Michael Landry, Gigantic Numbers

**Spring 2021**

- Feb 14: Victor Wickerhauser, Error Correcting Codes
- Feb 28: Silas Johnson, ARML Power Contest
- Mar 7: Xiang Tang, The Field of Cubic Roots
- Mar 14: Aliakbar Daemi, Cutting and Pasting Polygons
- Mar 28: Shuhao Cao, How to gamble like a mathematician if we must
- Apr 11: Gregory Knese, The 100 prisoner problem and other combinatorial surprises
- Apr 18: Adeli Hutton and Hyojeong Son, Chip-firing on Graphs

**Fall 2020**

- November 15, 2020: Adeli Hutton: Math of Gerrymandering
- November 8, 2020: Annamary King: The Collatz Conjecture
- November 1, 2020: Matt Kerr: Symmetries and Counting
- October 25, 2020: Shuhao Cao: How to let your computer learn to tell cats from dogs

**Spring 2020**

- March 1, 2020: Xiang Tang: Rigidity of Convex Polyhedra
- February 23, 2020: Sonya Land: MO ARML
- February 16, 2020: Jeff Norton:
- February 9, 2020: Rick Armstrong: MO ARML
- February 2, 2020: Tyler Williams: What is the Deal with Prime Numbers?
- January 26, 2020: Chip Day: MO ARML

**Fall 2019**

- November 24, 2019: Chip Day: MO ARML – Mod Arithmetic
- November 17, 2019: Jesus Oyola Pizarro: What’s a derivative? What’s differentiation?
- November 3, 2019: Rick Armstrong: MO ARML
- October 27, 2019: Haohua Deng: Solving Combinatorics Problems by Telling Stories
- October 20, 2019: Nathan Wagner: Fun with Paradoxes
- October 13, 2019: Rick Armstrong: MO ARML – Puzzles
- October 6, 2019: Tyler Williams: Fun with Complex Numbers and Polynomials
- September 29, 2019: Sonya Land: MO ARML – Intro to Math League
- September 22, 2019: Michael Landry: Seifert Surfaces of Knots and Links

**Spring 2019**

- Matt Kerr: Cows, Pell’s equation, and lattices
- April 14, 2019: Mohammad Jabbari: Proofs Without Words II
- March 24, 2019: Jesus Oyola Pizarro: An Introduction to Knot and Link Theory
- February 24, 2019: Victor Wickerhauser: Euclid’s Algorithm
- January 27, 2019: Rick Armstrong: MO ARML – AMC Prep and Complex Numbers

**Fall 2018**

- November 11, 2018: Mohammad Jabbari: Approximating pi by Experiment
- November 4, 2018: Nathan Wagner: Fun with Combinatorial Games, Supplemental Sheet
- October 14, 2018: Yasha Berchenko-Kogan: How many ways are there to arrange chairs around a round table?
- October 7, 2018: Sonya Land: MO ARML Fantastic Factoring
- September 30, 2018: Akehiko Takahashi: Wonders of Math
- September 16, 2018: Rick Armstrong: Missouri ARML

**Spring 2018**

- April 15, 2018: Rick Armstrong: Learning Bridge & Probability, Part II: Pascal Triangle (Answers)
- April 8, 2018: James Pascoe: Learning Bridge & Probability, Part I:
- March 25, 2018: Matt Kerr: Dinner Parties and Coloring Books
- March 4, 2018: Mohammad Jabbari: Proofs Without Words
- February 18, 2018: Benjamin Castor: Problem Solving Techniques
- February 11, 2018: Zhenghui Huo: The Game of Set
- February 4, 2018: Nathan Wagner: The Birthday Problem
- January 28, 2018: Nan Lin: AM – GM Inequality

**Fall 2017**

- November 19, 2017: Xiang Tang: Symmetry Groups
- November 12, 2017: Mohammad Jabbari: Order Appearing in Coloring Large Set of Data
- October 29, 2017: Rick Armstrong: Taxi Cab Geometry
- October 15, 2017: Nan Lin: Geometric Probability
- October 8, 2017: Victor Wickerhauser: A Run Through Some Fields
- October 1, 2017: Zhenghui Huo: Graph Puzzles
- September 24, 2017: Chang Liu: Probability Paradox
- September 17, 2017: Christopher Felder: Hilbert Hotel

**Spring 2017**

- April 9, 2017: Matt Kerr: Roller Coasters!
- April 2, 2017: Mohammad Jabbari: The Mysteries of the Floor Function
- March 26, 2017: Jose Figueroa-Lopez: Financial Mathematics: From Games of Chance to No Free Lunch
- March 5, 2017: Tian Wang: Counting Methods
- February 19, 2017: Ake Takahashi: Hidden Wonders of Numbers
- February 12, 2017: Rick Armstrong: Non-Transitive Dice
- February 5, 2017: Xiang Tang: Geometric Numbers
- January 29, 2017: Todd Kuffner: Relations Between Different Math Problems

**Fall 2016**

- November 20, 2016: Mohammad Jabbari: Pi
- November 13, 2016: Jimin Ding: Statistics
- November 6, 2016: Cody Stockdale: The Size of the Cantor Set
- October 30, 2016: Yingxuan Li: Cardinality of Sets
- October 16, 2016: Qi Wang: Dependent Events
- October 2, 2016: Victor Wickerhauser: Pigeons and Rams(ey)
- September 25, 2016: Qiyiwen Zhang: Art of Counting
- September 18, 2016: Chris Cox: Partitions of the Plane

**Spring 2016**

- April 3, 2016: Brett Wick: Geometry, Probability, and Computation of Pi, 2nd Handout
- March 20, 2016: Tiansi Li: The Pigeonhole Principle
- March 13, 2016: Mohammad Jabbari: How Many Goats in the Orchard?
- March 6, 2016: Chris Cox: Mathematics of the Billiard Model, Presentation
- February 28, 2016: Greg Knese: Coins in 7-11 Land
- February 21, 2016: Wushi Goldring: Sum of Squares
- February 14, 2016: Junior Genival Francisco Fernandes da Silva: Graph Coloring
- February 7, 2016: Greg Budzban: The Road Coloring Problem (no presentation, classroom activity)
- January 31, 2016: Cody Stockdale: Dots, Lines, and Graphs
- January 24, 2016: Xiang Tang: Dissections

**Fall 2015**

- November 22, 2015: John McCarthyi: Hexagons and Pentagrams
- November 15, 2015: Mohammad Jabbari: Adding the Reciprocals of All Prime Integers; Hints and Answers
- November 8, 2015: Tokio Sasaki: Loops and the Winding numbers
- November 1, 2015: Cody Stockdale: Pascal’s Triangle and Fractals
- October 25, 2015: Matt Kerr: Zigzag Paths and Updown Mountains
- October 18, 2015: Renjie Lyu: P-adic Integers
- October 11, 2015: Jimin Ding: Statistics and Sampling
- October 4, 2015: Tiansi Li: Counting Problems
- September 27, 2015: Travis Li: Non-Euclidean Geometry
- September 20, 2015: Victor Wickerhauser: Error Correcting Codes

**Previous Semesters**

- January 25, 2015: Blake Thornton: Mathematical Black Holes
- November 23, 2014: Holly Bernstein:
- November 16, 2014: Adam Weyhaupt: Cubes, Cubes, Cubes
- October 26, 2014: Travis Li: Modular Arithmetic (Solutions)
- October 5, 2014: Kyle Sykes: Sprouts
- September 28, 2014: Greg Knese: Chomp the Graph
- September 21, 2014: John McCarthy: Summing
- March 9, 2014: Travis Li: Circles
- February 23: Darren Garbuz: Tic Tac Toe and Glueing Squares
- February 9, 2014: Matt Kerr: Symmetries and Counting
- February 2, 2014: Muxi Li: Knight’s Tour
- January 26, 2014: Ivan Horzov: Gaussian Integers
- November 25, 2013: Xiang Tang: Tessellations
- November 17, 2013: Kyle Sykes: Slide Rules
- October 27, 2013: Dave Meyer: Math Battle
- October 20, 2013: Junior Fernandes Da Silva: Hat Problems
- Sept 29, 2013: Greg Knese: King Chicken
- Sept 22, 2013: Victor Wickerhauser: Pigeons
- Apr 14, 2013: Kyle Sykes: Hexaflexagons
- Apr 7, 2013: Jenny Yeon: Binary Numbers and Binary Number Magic Trick
- Mar 31, 2013: Lisa Kuehne: Mathematical Voting
- Mar 3, 2013: Peter Luthy: Odd Sums
- Feb 24, 2013, Steven Krantz: Probability
- Feb 17, 2013, Xiang Tang: Make 24
- Feb 10, 2013, John McCarthy: Fibonacci
- Nov 11, 2012, Tejas Kalelkar: Graph Theory
- Nov 4, 2012, Ivan Horozov: Perfect Numbers
- Oct 21, 2012, Kelly Bickel: Math and Magic
- Oct 15, 2012, Alvaro Pelayo: More Codes!
- Oct 7, 2012, Matt Kerr: RSA Codes
- Sept 30, 2012, Vincent Kieftenbeld: More Infinity
- Sept 23, 2012, Kyle Sykes: Hotel Infinity
- Sept 9, 2012, Victor Wickerhauser: Recusion and Induction (Recursion Homework, Induction Homework)
- April 8, 2012, Kyle Sykes: Mathematician Guards an Art Gallery
- April 1, 2012, John McCarthy: Penrose Tiling
- March 4, 2012, Holly Bernstein: Toplogy Puzzles
- February 19, 2012, Chris Cox: Steiner Networks
- February 12, 2012, Bingyuan Liu: Chinese Remainder Theorem
- February 5, 2012, Renato Feres: Mazes
- January 29, 2012, Kelly Bickel: Haga’s Origamics
- November 20, 2011, Chang Chao: Pile Subdividing
- November 13, 2011, Qingyuan Wang: Diophantine Equations
- October 30, 2011, Qingxia Li: Finite Geometry
- October 16, 2011, Vincent Kieftenbeld: Euclidean Algorithm
- October 9, 2011, Xiang Tang: Topological Conundrums
- October 2, 2011, Matt Kerr: The P-Adics!
- September 25, 2011, Jimin Ding: Puzzling Probabilities
- September 18, 2011, Russ Woodroofe: Non-Platonic Polyhedra
- September 11, 2011, Tejas Kalelkar: Knots!
- April 10, 2011, Andy Womack: Nim and Friends
- March 27, 2011, Kelly Bickel: Balloon Twisting
- March 6, 2011, Kabe Moen: Tilings and Slides
- February 27, 2011, David Meyer: Code Breaking
- February 20, 2011, Jonathan Marshall: Probability Paradoxes
- February 13, 2011, Scott Cook: Blue Eyed Island
- November 14, 2010. Matt Kerr: Criss Cross
- November 7, 2010. Alvaro Pelayo: Number Theory and Codes
- October 24, 2010. Kabe Moen: Celestial Calculations, (Slides)
- October 10, 2010. Sara Gharahbeigi: Elliptic Curves,
- October 3, 2010. Andy Womack: Game of Set,
- September 26, 2010. Xiang Tang: Mersenne Primes
- September 19, 2010. Baili Min: Compass and Straight Edge
- April 25, 2010. Andy Womack: Olympiad: Middle School and High School
- April 18, 2010. Jeff Langford: Catalan Numbers
- March 28, 2010. Qing Li: Math Battle! and Introductory Battle Problems
- February 28, 2010. Wei Deng: Lines and Triangles
- February 14, 2010. Sara Gharahbeigi: Geometry of Loci
- February 7, 2010. Marina Dombrovskaya: Sodoku
- January 31, 2010. Josh Brady: KenKen
- October 25, 2009. Arno Van Den Essen: Magic Squares
- October 18, 2009. Nic Sedlock: Lion-Llama-Lettuce
- October 4, 2009. Russ Woodroofe: Non-Platonic Polyhedra
- September 27, 2009. Kelly Bickel: Bridges of Konigsberg
- September 20, 2009. Andrew Lewis: Chocolate and Nim
- September 13, 2009. Blake Thornton: Nontransitive Dice
- July 24, 2009. Blake Thornton: Mathematical Battle
- June 19, 2009. Blake Thornton: Russian Circle – Circle Problems
- June 19, 2009. Blake Thornton: Russian Circle – Circle Problems 2
- June 19, 2009. Blake Thornton: Mathematical Auction
- April 19, 2009. Baili Min: Chinese Remainder Theorem
- April 5, 2009. Jeff Langford:

- March 29, 2009. Andy Womack: Clock Arithmetic
- March 1, 2009. Jonathan Browder: How to Count
- February 22, 2009. Geir Arne Hjelle: Conway’s Game of Life
- February 1, 2009. Emily Ronshausen: The Game of Chomp
- January 18, 2009. Russ Woodroofe: Graph Theory
- November 23, 2008. Michael Deutsch: Liars and Truth-Tellers
- September 28, 2008. Brad Henry: Connect Three and Connect Four Rules
- September 21, 2008. Blake Thornton: Polyhedra and Platonic Solids
- March 2, 2008. Blake Thornton: Mathemagical Card Tricks
- February 24, 2008. Brad Henry:
- February 3, 2008. Blake Thornton: Problem Solving
- January 20, 2008. Eugenio Hernandez: Color Pascal’s Triangle
- November 18, 2007. Chris Niemann: Quarternion Slide Rule
- November 11, 2007. Scott Cook: Cryptography
- October 7, 2007. Brian Maurizi: Slide Rules
- September 30, 2007. Blake Thornton: Modular Arithmetic and Doomsday
- April 22, 2007. April. Geir Arne Hjelle:
- March 4, 2007. Emily Ronshausen: Graph Theory
- January 21, 2007. Blake Thornton: Triangles
- October 22, 2006. Bob McDowell:
- September 24, 2006. Brian Maurizi: Mobius Bands
- 2005. Brian Maurizi: Geometric Arithmetic
- 2005. Brian Maurizi: Monopoly
- 2005. Brian Maurizi: Soduko Graph Theory