## Welcome!

#
**ΣUMS has a new website. Check it out here!**

Sydney University Maths Society (also known as ΣUMS or SUMS) is a club for students with an interest in any and all things maths-related.

We host a variety of events catered for every kind of maths enthusiast. We're known for holding fun and interesting talks on unusual areas of mathematics, as well as hosting cake bakes, maths relays, puzzle days, and trivia nights. But most importantly, at every event there's free pizza!

If you'd like to become a member of ΣUMS, simply fill out this form so that we can add you to our members and mailing list. We usually don't email more than once a week.

Feel free to email us with any questions, comments, or suggestions as well.

Be sure to check us out on Facebook to keep updated on all our upcoming events! You can also check our calendar below.

## Events

**Talks:** Our weekly mathematical talks are held on **Thursdays** at **1-2pm**, currently in **New Law 104**. These go for thirty to forty minutes and are concluded with a helping of pizza and drinks. Previous talk topics have ranged from
the mathematics of sound design to solving *n*-dimensional Rubik's cubes, and have included titles such as "Hats, Buckets, and Pascal's Triangle" and "Is There a Zombicidal Maniac Nearby? You Better Hope So! (Statistically surviving a zombie apocalypse)".

**Mixer:** We hold a mixer in the first week of each semester so that new and old members alike can meet each other over pizza and games.

**Puzzles:** Arguably our biggest event is the **ΣUMS Puzzle Hunt**, which is held over one week sometime in second semester. Teams of up to five people compete online to solve 20 puzzles over 8 intense days, and the winners are awarded hundreds
of dollars in prizes.
This year's Puzzle Hunt is being held over the week beginning Monday 2 July. Previous years' puzzles can be found by visiting the archives page.

**Maths Relay**: A competition where members form teams to see who can solve the most maths problems in a specified period of time. Prizes are awarded based on speed and number of correct guesses. These questions are written to be more fun and thought-provoking
than outright difficult or formulaic.

**Cake Bake**: Once or twice a year we hold a cake-baking competition. Cakes are judged in a range of categories including "Best Tasting" and "Best Mathematical Reference", and awarded prizes. Then we eat them.

**Trivia Night / Letters & Numbers**: ΣUMS has on occasion hosted the trivia night at Manning Bar. We hold big Letters & Numbers competitions at ISL from 5-6pm one or twice a semester (joint event with CrossSoc).

**LaTeX Workshop**: Early in semester we hold a workshop providing a brief introduction and overview of LaTeX. If you're looking to typeset beautiful mathematics with relative ease, this is the event for you! The documents we used at the last workshop
can be found here.

## 2018 Calendar

*March 8*: Semester 1 Mixer

*March 13*: Letters and Numbers

*March 15*:

**A Better World with a Base 12 Counting System**– Andy Tran

*March 22*:

**Statistical Image Reconstruction in Positron Emission Tomography**– Yiwei Mao

*March 29*:

**How to get out of Jail**– Shane Arora

*April 12*:

**Mind, Maths and Megaminxes**– Richie Lim

*April 19*:

**Trisecting the angle: Neusis and other Tricks**– Alex Babidge

*April 26*:

**The Philosophy and Mathematics of Rational Decisions**– Prof. Mark Colyvan

*May 3*:

**Lightning Talks**:

**A computer-based solution to the tower of Hanoi problem**– John Su

**Latent Variable Models: Useful but Arbitrary?**– Jaden Costa

**What actually is the Axiom of Choice?**– Hazel Browne

*May 10*:

**Three angles on tropical geometry**– Associate Prof. Stephan Tillmann

## 2018 Committee

President |
Shane Arora |

Vice-President |
Edric Wang |

Secretary |
John Su |

Treasurer |
Yiwei Mao |

Social Coordinators |
Johnny Lim, Terry Shang |

IT Officer |
Cameron Eggins |

Women's Officers |
Edda Koo, Hazel Browne, Maggie Tong |

Sponsorship Director |
Gordon Li |

Puzzle Officer |
Radman Zhang |

First-Year Representative
| Ryder Chen |

General Executive |
Andy Tran, Richie Lim, Yinuo Han |

## 2017 Calendar

(Thursdays 1-2pm in New Law 104 or 106 except where noted)

*March 6*: Letters & Numbers @ ISL (with CrossSoc) (5-6pm)

*March 9*: Semester One Mixer

*March 16*:

**Generatingfunctionology**– Edric Wang

*March 23*:

**Multiplication and Division… In Style!**– Johnny Lim

*March 28*: LaTeX Workshop (2-3pm Carslaw 610-611)

*March 30*:

**Entanglement and Teleportation**– Eric Huang

*April 6*:

**An overview of magic squares**– David Gruenewald

*April 13*: GM: Election of First-Year Representative and Women's Officers

*April 20*:

**A (mega) brief introduction into ergodic theory**– Alexander Fish

*May 4*:

**Some assorted problems w.r.t. polygonal numbers**– Alex Babidge

*May 11*: (Probability-themed) maths relay

*May 18*:

**Tau: The True Circle Constant**– Andy Tran

*May 25*:

**FMC: Efficient Rubik’s Cube Solving**– Richie Lim

*June 1*:

**Lightning Talks**:

**Group theory and symmetry in chemistry**– Maggie Corrigan

**Alternating decimal digits of (reciprocals of) repetend primes**– David Gruenewald

**The houdini ant**– Johnny Lim

*August 3*: Semester 2 Mixer

*August 7*: Letters & Numbers @ ISL (with CrossSoc) (5-6pm)

*August 10*:

**How to find a derivative?**– Gordon Li

*August 17*:

**Nobody solves the quintic**– Dror Bar-Natan

*August 24*:

**The maths behind modern music**– Jaden Costa

*August 31*:

**How to lie with probability**– Yang Song

*September 7*:

**Life on cheat mode: an overview of Game Theory**– Leslie Marsh

*September 12*:

**A brief introduction to Ramsey Theory**– Jonathan Zheng

*September 19*: ΣUMS Annual General Meeting

*September 21*:

**An introduction to image classification**– Damon Zhong

*October 5*:

**Overview of Statistical Methods in Selective Breeding**– Emi Tanaka

*October 12*:

**Gödel’s Incompleteness Theorems: questioning the foundations of mathematics**– Hazel Browne

*October 19*:

**Game Theory and Evolutionary Biology**– Sida Yuan

*October 26*:

**Image Reconstruction in Computed Axial Tomography**– Yiwei Mao

*November 2*: Cross Number Contest

## 2016 Calendar

(Thursdays 1-2pm in New Law 104 except where noted)

*March 3*: Semester One Mixer

*March 8*: Letters & Numbers @ Manning (with LingSoc and CrossSoc) (5-6pm)

*March 10*:

**Tiling with Rectangles**- Sean Gardiner

*March 17*:

**How I learned to stop worrying and love floating point numbers**- Mark Greenaway

*March 22*: GM: Election of First-Year Representative and General Executive

*March 22*: LaTeX Workshop (1:30-2:30 Carslaw 610-611)

*March 24*:

**Calculating the date of Easter**- David Gruenewald

*April 5*: Breaking Barriers Webinar &

**Panel Discussion**(with SUWIE) - Nalini Joshi, Kate Jolliffe, and Julie Cairney (10-1:30 Women's College)

*April 7*:

**The Base 12 Counting System: A Superior Alternative to the Decimal System**- Andy Tran

*April 14*: Maths Relay (winners: Team-Star)

*April 20*: Letters & Numbers @ ISL (with LingSoc and CrossSoc) (5-6pm)

*April 21*:

**The Sound of Science: Describing Sounds Using Mathematics**- Joachim Worthington

*April 28*:

**Introduction to Julia Sets and Their Dynamics**- David Long

*May 5*: Puzzles & Games Day

*May 12*:

**Lightning Talks**:

**Super Dense Coding**- Alex Babidge

**Guarding Galleries**- Sean Gardiner

**Arithmetic in Base -1+i**- Kevin Liang

*May 16*: Cake Bake (12:30-1:30 Carslaw kitchen)

*May 19*: GM 2 and

**Lightning talks**:

**Australia's next top statistical model V2.0**- Kevin Wang

**Deterministic Chaos!?**- Longen Lan

**Friday the 13th**- David Gruenewald

*May 19*: Industry Talk - Optiver (New Law 342, 6-8pm)

*May 26*: Maths Relay (winners: Team Radman)

*June 2*:

**Mathematics and Healthy Hearts**- Mary Myerscough

*July 28*: Semester Two Mixer

*August 2*: Letters & Numbers @Manning (with CrossSoc) (5-6pm)

*August 4*:

**1 = 1+1**- Jonathan Zheng (Cambridge)

*August 11*:

**Untangling Knot Theory**- Sean Gardiner

*August 18*: Puzzles & Games Day

*August 25*:

**The Mathematics of Biological Pattern Formation, or How the Leopard Got Its Spots**- John Wormell

*August 25*: Maths Relay @ Optiver (5:30pm)

*September 1*:

**Triangle Transformations and the Euler Line**- Rachel Wong (Cambridge)

*September 8*: Integration Bee

*September 14*:

**Knitting Mathematics**- Julia Collins (Edinburgh)

*September 20*: Letters & Numbers @ Manning (with CrossSoc) (5-6pm)

*September 22*: ΣUMS Annual General Meeting

*October 6*:

**Demystifying Quantum Computing**- Eric Huang

*October 13*:

**The Pokémon Collector's Problem: What are the Chanseys?**- Kevin Wang

*October 20*:

**Dithering, uncertainty, and loping basslines**- Richard Garner (Macquarie)

*October 27*:

**Lightning Talks**:

**Quadratic Sieve Factorisation for Somewhat Large Numbers**- Kevin Liang

**Poisson Process, Pokémon, and Prime Numbers**- Kevin Wang

**The Nobel Prize in Chemistry (or is it really Maths?)**- Maggie Corrigan

## 2015 Calendar

*March 5*: Semester One Mixer

*March 12*:

**The Mathematics of SET**- Sean Gardiner

*March 17*: Post-Pi Day Cake Bake

*March 19*:

**Women in Maths and Maths in the World**- Nalini Joshi, with Caity McGregor, Claire Edmunds, and Maggie Corrigan

*March 26*:

**Counterfeit Coin Conundrums**- Gareth White

*April 2*:

**Work Like an Egyptian**- Leon Poladian

*April 2*: Post-WCC social cricket match

*April 14*: Letters & Numbers (Mostly Numbers) competition #1

*April 16*:

**Consequences of a Combinatorial Theorem**- Gerry Myerson (Macquarie)

*April 23*:

**Scissors Congruence and Hilbert's 3rd Problem**- Stephan Tillmann

*April 28*: GM: Election of First-Year Representative; mini Letters & Numbers Competition

*April 30*:

**Solving Rubik's Cubes**mini-talk + cubing competition

*May 7*: Maths Relay (winners: The Butterfly Catchers Society)

*May 14*:

**Diophantine Analysis and Transcendental Numbers**- David Lee

*May 21*:

**Multiscale, multidisciplinary and multi-method: How (mathematical) honey bees find a home**- Mary Myerscough

*May 28*: Lightning Talks:

**Hailstone Numbers**- Josh Ciappara

**Non-linear Chemical Dynamics**- Maggie Corrigan

**Rational Tangles**- Sean Gardiner

**Australia's Next Top Statistical Model**- Kevin Wang

*June 4*: Puzzles & Games Day

*June 11/12*: ΣUMS Stuvac study sessions

*July 30*: Semester Two Mixer

*August 5*: Letters & Numbers @ Manning with LingSoc and CrossSoc (winners: Numb Bears)

*August 6*:

**How to win (variants of) Tic-Tac-Toe**- Sean Gardiner

*August 7*: ΣUMS Problem Competition closes

*August 11*: Ashes-commiseration social cricket match

*August 13*:

**Differential equations with trees**- Chris Ryba

*August 20*:

**Australia won the Ashes, statistically**- Kevin Wang

*August 27*: Maths Relay (winners: The Perfect Storm)

*September 1*:

__Synthetic Biology: Now Statistically Significant__- iGEM industry talk

*September 3*: Lightning Talks:

**Tau: The Superior Alternative to Pi**- Andy Tran

**Infinite Infinities**- Jonathan Zheng (Cambridge)

**Good Sort Bad Sort**- Rachel Wong (Cambridge)

**Light and Geometry**- Vaishnavi Calisa

*September 10*:

**Modal Logic: Formalising the Necessary and Possible**- Caity McGregor

*September 17*:

**Möbius, Klein and Real Projective Space**- Ross Ogilvie

*September 17*:

__Quantitative Careers: Trading on the Sports Betting Market__- Priomha Group careers talk

*September 24*: Puzzles & Games Day

*October 8*:

**Breaking (badly constructed) 1024-bit RSA**- Yinan Zhang

*October 15*:

**When applied mathematics collided with algebra**- Nalini Joshi

*October 22*: ΣUMS Annual General Meeting

*October 29*: Letters & Numbers with LingSoc and CrossSoc #2 (winner: Power of One)

*October 30*: End of semester drinks

*November 2*: ΣUMS Puzzle Hunt 2015 begins!

*November 5/6*: ΣUMS Stuvac study sessions

## 2014 Calendar

*March 6*: Semester One Mixer

*March 13*:

**Shadowboxing: Lengths, Areas, and Projections**- Ivan Guo

*March 20*:

**Game Theory and Nimbers**- Sean Gardiner

*March 27*:

**Curvature: from Euclid to Einstein**- Tim Large (Cambridge)

*April 3*:

**Everyone Hates Vector Calculus**- David Vasak (Cambridge)

*April 9*: Trivia Night

*April 10*:

**Puzzling the 120-Cell**- Saul Schleimer (Warwick)

*April 17*: Maths Relay (winners: Team Hyperspace-Blaster)

*May 1*:

**Triangles and Musical Chords**- Rob Tang (Warwick)

*May 8*: Puzzles & Games Day

*May 15*:

**Solving and Writing Puzzles**- Sean Gardiner

*May 22*: Lightning Talks:

**Islanders' Eye Colours**- Merlin Ge

**Knot Knitting**- Kitty Chang

**Mafiamatics**- Sean Gardiner

**The Soap Opera Problem**- Kevin Wang

**Why Pi is not 22/7 and Other Facts**- Leon Poladian

*May 29*:

**Algorhythms**- Joachim Worthington

*June 5*: Cake Bake (winner: Venn diagram cake)

*July 31*: Semester Two Mixer

*August 7*:

**Circle Packing**- Sean Gardiner

*August 14*:

**Programming with Fractions**- Kevin Liang

*August 21*:

**Gauss, the Heptadecagon, and the Freemasons**- Leon Poladian

*August 28*: Puzzles & Games Day

*September 4*: Maths Relay (winners: The Butterfly Rescue Club)

*September 11*:

**Three Angles on Tropical Geometry**- Stephan Tillmann

*September 18*:

**What Mathematics Do We See in Artwork?**- Clio Cresswell

*September 25*:

**Minding Your P's and Q's: Adventures in Statistical Inference**- John Wormell

*October 9*:

**Rubik's Cube and Related Puzzles**- Leanne Rylands (Western Sydney)

*October 16*:

**An Overview of Magic Squares**- David Gruenewald

*October 23*: ΣUMS Annual General Meeting

*October 27*: ΣUMS Puzzle Hunt 2014 commences!

*October 30*: Lightning Talks