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  • Presentations
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Washington University Math Circle

Presentations

Materials from Our Presenters
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:
    • Unexpected Twists
    • Unexpected Twists II
  • February 9, 2020: Rick Armstrong: MO ARML
    • Sprint
    • Target
  • February 2, 2020: Tyler Williams: What is the Deal with Prime Numbers?
  • January 26, 2020: Chip Day: MO ARML
    • Team Relay 11901
    • Team Relay 12001
Fall 2019
  • November 24, 2019: Chip Day: MO ARML - Mod Arithmetic
    • Practice
    • Properties
    • Solutions
  • November 17, 2019: Jesus Oyola Pizarro: What's a derivative? What’s differentiation?
  • November 3, 2019: Rick Armstrong: MO ARML
    • Fantastic Factoring
    • Patterns and Problems - Relay
  • 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
    • Killer Sudoku
    • Kakuro
    • KenKen
  • 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
  • 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
    • ​AMC 10 Practice
    • AMC 12 Practice
    • Geometry of 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​
    • Intro Relay
    • Power of a Point
    • Power of a Point Relay
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:
    • High Card Points and Combinatorics (Answers)
    • No Trump Scoring (Answers)
  • 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:
    • Topological Puzzles
    • London Underground
    • London Underground Tube Map
  • 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: 
    • Pick's Theorem 
    • Pick's Theorem-lattices
  • 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:
    • Voting - 1
    • Voting - 2
  • 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:
    • Chaos 1
    • Chaos 2
  • March 4, 2007. Emily Ronshausen: Graph Theory
  • January 21, 2007. Blake Thornton: Triangles
  • October 22, 2006. Bob McDowell:
    • Liars and Truthtellers
    • ODT file of Liars and Truthtellers
  • September 24, 2006. Brian Maurizi: Mobius Bands
  • 2005. Brian Maurizi: Geometric Arithmetic
  • 2005. Brian Maurizi: Monopoly
  • 2005. Brian Maurizi: Soduko Graph Theory
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