## Help needed in pre-colloquium build

We need a few students to help build the object shown below. This object (which I’m sure we will learn the name of during the colloquium) will be used in the colloquium on symmetry (details below). We will start the build at 2:00 PM on Tuesday, February 5 in the lobby outside the lecture halls on the first floor of VanderWerf. The build will probably last until around 4:00 PM. If you can’t come at the beginning, you are still welcomed to help when you can. **As a bonus you can earn a colloquium credit for helping build!**

## Math Colloquium on Symmetry next week

**Title:**Symmetry: A mathematical approach using group theory and linear algebra**Speaker:**Dr. David Reimann, Albion College**When/Where:**4 pm on Tue, Feb 5 in VanderWerf 102

**Abstract:**Symmetric patterns are used in many situations to decorate an object with a repeating motif that is translated, rotated, or reflected without changing size. We will see examples of several symmetry types and look at these from the vantage point of group theory. In particular, we will study rosette patterns, frieze patterns, wallpaper patterns, and patterns on the sphere. We will then see how we can create all these pattern types with a unified framework based on the vectors and matrices of linear algebra.

## Upcoming Colloquia

The following colloquia are currently scheduled for this semester. More should be added as the semester goes on.

- Feb 5 at 4:00 pm, David Reimann, Albion College
- Feb 21 at 11:00 am, Yew Ming Koh and students, Hope College
- April 4 at 4:00 pm, Yew Ming Koh and Tyler Gast

## Students pass Actuarial Exam

## Statistics Showcase

**“The Effects of Music on Memory Tasks”**by Johanna Emmanuel, Sophia Kleinheksel, and Ian McNamara**“Accurate Portions: Shapes and Gender?**by Jamie Breyfogle, Montserrat Dorantes, and Haley Russell**“How Do People React to Political Bias (Discrimination) Based on Party Affiliation”**by Saydee Johns, Drew Schmitz, Curtis Turner, Samuel Vree, and Caleigh White**“Hope College and Recycling”**by Franciska Loewen, Andrew Pavey, Jamie Westrate, and Andi Yost**“How Much Do You Remember: The Effects of Both Physical Activity and Gender on Working Memory?”**by Jessica Danielle Bernal, Isaiah Hough, and William Woodhams**“Gender Stereotypes in the Workplace: The Next Generation?”**by Rachel Hofman, Madison Kerber, Meghan Peel, and Jada Shelby**“Are We Dreaming of a White Christmas? A Study on Christmas Music and Feelings about Snow”**by Hannah Bugg, Briar Hanlon, and Joseph Hernandez

## Numberphile: How to pick the best porta-potty or soul mate

## Problem Solvers of the Fortnight

Congratulations to Cal Barrett, Bradley Baysore, Meredith Bomers, Marina Budinsky, Jonathan Chaffer, Regan Corum, Adam Czeranko, Caroline Dargay, Idgie DeLoach, Holly Denouden, Christian Forester, Brandon Fuller, Graham Gould, Sydney Hines, Ruth Holloway, Elizabeth Inthisane, Yiwei Jiang, Fiona Johnson, Michael Kiley, Carson Koning, Jackson Krebsbach, Grant Lancaster, Mitchell Leonard, Dane Linsky, Julia Loula, Rebekah Ludema, James Manderville, Cole Manilla, Michelle Mathenge, Christopher McAuley, Cory McGregor, David McHugh, Marie McLaughlin, Rahja Flowers – Mitchell, Matthew Nguyen, Sarah Olen, Emma Oonk, Josh Paquin, Gina Polito, Mark Powers, Lauren Quenneville, Jack Radzville, Andrew Ragains, Keon Rick, Carmen Rodriguez, Rebecca Ruimveld, Forest Rulison, Nathan Schloff, Meghan Smith, Lydia Sprik, Riley St. Amour, Nelly Tankovo, Sean Traynor, Mary Urdaneta, Bethany VanHouten, Mike Walsh, Fangtao Wang, Jonathan Washburn, Neil Weeda, Lydia Won, Anna Wormmeester, Samantha Yacullo, Sarah Yonker– all of whom correctly solved the Problem of the Fortnight and figured out which dog received the 3.5 kg of food from the butcher.

## Problem of the Fortnight

A 3 × 3 magic square is a grid of distinct numbers whose rows, columns, and diagonals all add to the same integer sum. Sunnie creates a magic square whose sum is *N*, but her keyboard is broken so that when she types a number, one of the digits (0−9) always appears as a different digit (e.g. if the digit 8 always appears as 5, the number 18 will appear as 15).

The altered square is shown below. Find *N*.

Write up your solution (not just the answer) and drop in the Problem of the Fortnight slot outside Professor Mark Pearson’s office (room 212 in The Werf) by 3:00 p.m. on Friday, February 8. As always, be sure to include your name and the name(s) of your math professor(s) — e.g. David Copperfield, Professors Penn and Teller– on your solution. Good luck and have fun!