Date  Speaker  Title  Abstract 

9/18/23  Emilie Wiesner  Hats off: the einstein of aperiodic tilings 
In Spring 2023, mathematicians announced "the hat," the answer to a longstanding open question: Is there a single shape (or "einstein") that can tile the plane but such that no tiling ever has a repeating pattern (that is, an aperiodic tiling)? In this talk, I'll give an introduction to aperiodic tilings and some of the key ideas in proving "the hat" gives an aperiodic tiling. I'll have plenty of tiles to play with! 
10/9/23  John Maceli 
What is Mathematical Magic? 
Magicians have used mathematical ideas in their tricks for hundreds of years to entertain and mystify. Martin Gardner’s book “Mathematics, Magic, and Mystery” sparked a renewed interest in using mathematics in the construction of magic tricks, delighting both amateur magicians and professional mathematicians. We will explore some of the math behind the magic. 
10/23/23  David Freund  Knot
for Everyday Purposes 
Knots are a part of our everyday lives, from twisted strands of DNA, to shoelaces, braided hair, and the inevitable tangle of computer cords. Mathematics offers an insight into the structure and complexity of everyday knots and provides tools to tell them apart. Starting with pieces of string, we will explore the study of knots and how it ties together various fields of mathematics. No background knowledge is assumed. 
11/6/23  Lenley Aikin and Earth Sonrod  Math summer experiences and Math Awards! 
Come learn about summer math experiences and mentored research opportunities at IC that may be available to you. Following the presentation, you are invited to stay for an awards ceremony to recognize high student achievement in math courses over the past year. Refreshments will be served. 
11/27/23 in CNS 204 (jointly sponsored with Physics) 
Matt Sullivan, Department of Physics 
Physical measurements of electric and magnetic fields using a mathematical “trick”: Seeing magnetic multipoles using a smartphone 
Describing the shape of electric and magnetic fields is complex. A useful approach in mathematics and physics is to break up a complex problem into smaller pieces. One example of this is the Taylor series expansion for continuous functions, expansions like sin(x) ~ x  (1/3!)x^3 +…. Like the Taylor expansion, the field from a complicated source can be broken up into a multipole expansion. Every field has a monopole term, plus a dipole term, plus a quadrupole, and an octopole, etc. By manipulating the physical source of the field, we can eliminate the other multipoles and create a pure dipole, pure quadrupole, or even a pure octopole. In this talk we will explore the math behind the multipole expansion, explain how we created the pure multipole sources, and describe how one can measure these fields using internal sensors in a smartphone. 
Scheduled speakers, Fall 2023
Spring 2024, Scheduled Speakers
Date  Speaker  Title  Abstract 

2/5/24  TBA  TBA  
2/19/24  TBA  TBA  
3/4/24  TBA  TBA  
3/25/24  Daniel Tjie, Ithaca College alumnus  TBA  TBA 
4/22/24  Susanne Pumpluen, University of Nottingham  TBA  TBA 
Scheduled speakers, Spring 2023
All meetings will be inperson or hybrid via Zoom in Williams 320 from 45pm.
Date  Speaker  Title  Abstract 

Feb 6, 2023 
Jennifer K. Mann Austin, Associate Professor of Instruction, University of Texas at Austin 
A Tutorial on the Topology of DNA 
“…DNA can bend, twist, and writhe, can be knotted, catenated, and supercoiled (positive and negative), can be in A, B, and Z helical forms, and can breathe.” —Arthur Kornberg DNA topology is the study of those DNA forms that remain fixed for any deformation that does not involve breakage. DNA molecules that are chemically identical (same nucleotide length and sequence) but differ in their topology are called topoisomers. There are three topological DNA forms that are the natural consequence of the structure and metabolism of the double helix: knotted, catenated, and supercoiled DNA. Cellular DNA is either circular or constrained by being tethered at intervals to organizing structures. Thus, DNA knot and catenane resolution and supercoiling maintenance must occur locally. Controlling the topology of its DNA is critical to the cell. If unresolved, DNA knots could potentially have devastating effects on cells; DNA catenanes prevent genetic and cellular segregation. DNA negative supercoiling is essential for cell viability. Topoisomerases are enzymes within cells whose function is to control DNA topology. In this session, we will appreciate the packaging challenges within cells, explore the topology of DNA, and learn how cells deal with DNA entanglements. 
Feb 20, 2023  no colloquium  
Mar 6, 2023  Shaianne Osterreich, Ithaca College 
Using data to think about equity: what data do we need and what questions to ask? 
As economists interested in equity, data analysis can be extremely useful to demonstrate areas of concern and potentially reveal areas of policy relevance. This session will discuss issues related to data availability, putting together disaggregated descriptive data that captures the equity questions, figuring out good analysis techniques, and how to consider and convey the meaning of the results. 
Mar 27, 2023  Matt Thomas, Cornell University 
Causality and Statistics 
In many statistics classes, you'll hear or say "correlation doesn't equal causation." While this is true, statistical tools and techniques can be useful for exploring causal claims, even in observational studies. In this talk, I'll give an overview of some of these techniques, many coming from graph theory, to talk about when you should and shouldn't include covariates in models. Additionally, I'll talk about what the job of a statistical consultant is like, with plenty of time for questions and discussion. 
April 10, 2023  Erin Griffin, US Air Force Research Lab  Panda + Nematode = Gibbon: An Introduction to Adversarial Machine Learning  Machine learning has quickly become ubiquitous for tasks like object detection and classification, image and text generation, and more. However, these models may exhibit unexpected behavior and are vulnerable to intentional manipulation. In this talk, I will give a brief introduction to machine learning in general and adversarial machine learning in particular, in which we study these vulnerabilities and how to defend against them. 
April 17, 2023  Scott Wilson, Queens College,
The Graduate Center, CUNY 
Contemplating x^2 =1 where x is a square matrix, and the interesting structures that ensue 
Using familiar and elementary ideas from linear algebra and calculus, we'll be led by the suggestive title above. The numeral 1 literally means an identity matrix, and our contemplation will include exploring the questions
This is all the first step in a vast area of active mathematical research, with important open problems, on the study of certain higher dimensional shapes called manifolds. I'll share some perspectives on this at the end. It's best to come with a curious and open mind! 
April 24, 2023  Jerome Fung, Ithaca College 
Applications of Light Scattering by Clusters of Spheres 
What happens when you shine light on objects that are roughly the same size as the wavelength of the light, such as soot particles in the atmosphere, red blood cells, or aerosol droplets produced by coughing? The best way to analyze such problems turns out to be to treat them as scattering phenomena: an incident light wave interacts with the object and gets changed (scattered and/or absorbed) as a result – much like how ripples in a pond are scattered when they run into something on the surface of the water. In this talk, I will introduce the physics and mathematics of light scattering, which involves ideas from partial differential equations and linear algebra. I will focus specifically on numerical techniques for calculating scattering from clusters of spheres, for which there is no general analytical solution. I will discuss the application of these techniques to two computational physics projects in my group: validating an experimental technique for optically characterizing particles that are fractal aggregates, and modeling how nonspherical particles behave in optical tweezers and other complex beams.

Scheduled speakers, Fall 2022
All meetings will be inperson in Williams 320 from 45pm.
Date  Speaker  Title  Abstract 

10/3/22 
Kathryn Mann, Cornell University 
Topology and dynamics in dimension 3: Anosov flows 
Anosov flows are beautiful examples of dynamical systems, exhibiting "local chaos but global stability". I will describe some of an ongoing program to classify such flows on closed 3manifolds, bringing out some surprising relationships between geometry and topology of a manifold and the dynamical systems it supports. 
10/17/22 
Ted Galanthay, Ithaca College 
Life lessons from a mathematician 
In 20212022, I took a sabbatical leave from Ithaca College. Besides coming back from this experience with the belief that major corporations could benefit from an employee sabbatical leave program, I returned with a different outlook on how to live my life. In this talk, I will share my experiences in the context of five lessons I learned and how they relate to the equation dP/dt = 2P. 
11/14/22 
Martha KempNeilson, Ted Mburu, Earth Sonrod, Tommy Angel; Ithaca College 
Summer Math Experiences & Awards Ceremony 
Come learn about summer math experiences and mentored research opportunities at IC that may be available to you. The following students will be sharing their experiences and answering your questions:
Following the presentation, you are invited to stay for an awards ceremony to recognize high student achievement in math courses over the past year. 
Scheduled Speakers, Spring 2022
All meetings will be inperson in Williams 320 from 45PM.
Date  Speaker  Title  Abstract 

2/7/22 
Megan Martinez, Ithaca College 
The Mathematics of Islamic Geometric Design 
Islamic Geometric Design refers to a vast array of beautiful designs that were developed over centuries in predominantly Islamic regions of the world. At its core, geometric design focuses on creating interest with symmetry and color, and is the perfect marriage of mathematics and art. In this talk we will learn about the beautiful designs that evolved over the centuries and learn how we can recreate these designs with nothing but a compass and straightedge! Come prepared to draw and experiment. Materials will be provided! No art skills required! 
3/7/22 
Walter Hannah (IC Class of '06), Climate Model Developer at Lawrence Liverpool National Lab 
A Brief Introduction to Atmospheric Modeling 
Walter Hannah is an IC mathematics alumnus working as an atmospheric scientist and climate model developer for Lawrence Livermore National Laboratory funded by the US Department of Energy. Walter’s work revolves around developing a “next generation” climate model that will produce more detailed and realistic climate projections. This talk will briefly go over basic principles of atmospheric science and modelling, and how these relate to predicting weather and climate. It will also discuss the current state of the field and some exciting developments that are on the horizon. 
4/11/22  Whalen Symposium!  TBA  Check out the Whalen Symposium on Monday, April 11. Talks will run from noon2PM. Our math students will be presenting from 12PM in the Ithaca Falls Room. 
4/25/22  Balloons and Marshmallows: Time for some mathematical recreation!  TBA  TBA 
Scheduled Speakers, Fall 2021
All meetings will be inperson in Williams 320 from 45PM.
Date  Speaker  Title  Abstract 

10/4/21 
Martha KempNeilson, Lucy Loukes, and Joan Mattle (Current IC Math Majors) 
Math Summer Experiences: The Internship Edition 
Martha KempNeilson, Lucy Loukes, and Joan Mattle will share about their summer internship experiences. Join us to learn more about what internships are like and how to find them! 
10/18/21 
Emma Anderson, Jake Brown, and Anatara Sen (Current IC Math Majors) 
Math Summer Experiences: The Research Edition 
Emma Anderson, Jake Brown, and Antara Sen will share about their summer research experiences. Join us to learn more about what research experiences are likeand how to find them! 
11/1/21  Peter Maceli, Ithaca College  Farey & Fractions 
In this talk, using a strange yet simple way of adding fractions, we are able to catch a twodimensional view of the rational numbers. This geometric perspective provides a handson approach towards solving several fundamental questions in number theory. 
11/25/21  David Brown, Ithaca College  World War II Cryptography: The Enigma Machine 
In World War II, electromechanical cryptologic machines came into wide use. The most wellknown of these was the Enigma machine used by the German military. We’ll explore the mechanics of the Enigma machine and the incredible number of settings possible for sending a message. We’ll also indicate ways in which the Allies went about breaking the Enigma code. 
12/06/21  Capstone II Class  Senior Capstone Poster Session 
Math Capstone students will present posters of their yearlong projects. Posters will be on bulletin boards on the second floor of Williams. Peruse and talk to the Capstone Students about their fine work!
The posters being presented are:

Scheduled Speakers, Spring 2021
All meetings will be virtual, Mondays at 4pm. zoom link


Scheduled Speakers, Fall 2020
All meetings will be virtual, Mondays at 4pm. zoom link
Date  Speaker  Title  Abstract 

9/28/20  Peter Maceli  Graphs and Algorithms  Graph theory is a young and exciting area of discrete mathematics. Visually, a graph is just a collection of dots together with lines joining certain pairs of these dots. Though at first glance graphs may seem like simple objects to study, the field of graph theory contains some of the deepest and most beautiful mathematics of the last fifty years. Being an extremely visual field, many questions and problems in graph theory are easily stated,yet have complex solutions with far reaching implications and applications.In this talk, we will explore the close relationship shared between graphs and algorithms. Describing how certain families of graphs “look” and can be“built,” and how, in turn, this allows one to efficiently solve certain important combinatorial problems. 
10/5/20  A Virtual Escape Room  Today we change gears from our typical talk. We'll break into teams to try out a virtual escape room! If you have a team in mind, email Matt Thomas (mthomas7@ithaca.edu) with your team. Otherwise, just show up and we'll make some teams!  
10/12/20  Priya V. Prasad, University of Texas at San Antonio  Teaching Geometric Congruence  Euclid and Hilbert both based their developments of axiomatic geometry on metric definitions of congruence, but current state standards (such as the Common Core State Standards for Mathematics and the Texas Essential Knowledge and Skills Standards) implicitly rely on an isometric definition of congruence. So how can teacher educators prepare future secondary geometry teachers to teach an axiomatically coherent geometry based on this definition? We developed a task using Taxicab geometry that can perturb students’ internalized metric definition of congruence. This talk is based on work done with Steven Boyce at Portland State University. 
10/19/20  Benjamin Levy, Fitchburg State University  An Introduction to Disease Modeling with an Application to HIV/AIDS in Kenya 
One can use mathematical techniques to model disease outbreaks such as COVID19, Ebola, or HIV/AIDS. We can then use model simulations to make future projections about the number of cases, consider the impact of intervention strategies, or analyze other key characteristics of an epidemic. This presentation will begin by introducing the compartmental framework commonly used to model infectious diseases, which will be illustrated by some simple models. After we lay some groundwork, a specific application to modeling HIV/AIDS in Kenya will be presented. In this application we formulate a compartmental system of ordinary differential equations (ODEs) to consider how stigma towards people living with HIV/AIDS has impeded the response to the disease. We take a datadriven approach to embed a timedependent stigma function within our model for HIV dynamics and estimate model parameters from published data. We then explore a range of scenarios to understand the potential impact of different public health interventions on key HIV metrics such as prevalence and diseaserelated death, and to see how close Kenya will get to achieving UN Goals for these HIV and stigma metrics by 2030. 
10/26/20  Emilie Wiesner, Ithaca College  Ping Pong and Sleeping Beauty: Playing with Paradoxes  We'll spend the first part of the hour thinking and talking about ping pong and Sleeping Beauty (two of my favorite paradoxes). The second part of the hour we'll have some paradox show and tell, so come prepared with your own favorite paradox. 
11/2/20  John Gemmer, Wake Forest University  Why is Lettuce so Wrinkly?  Many patterns in Nature and industry arise from the system minimizing an appropriate energy. Examples range from the periodic rippling in hanging drapes to the sixfold symmetries observed in snowflakes. Torn plastic sheets and growing leaves provide striking examples of pattern forming systems which can transition from single wavelength geometries (leaves) to complex fractal like shapes (lettuce). These fractal like patterns seem to have many length scales  the same amount of extra detail can be seen when looking closer (“statistical selfsimilarity”). It is a mystery how such complex patterns could arise from energy minimization alone. In this talk I will address this puzzle by showing that such patterns naturally arise from the sheet adopting a hyperbolic nonEuclidean geometry. However, there are many different hyperbolic geometries that the growing leaf could select. I will show using techniques from analysis, differential geometry and numerical optimization that the fractal like patterns are indeed the natural minimizers for the system. 
11/16/20  Gabe Pesco, Rachel King, and Jake Brown  Summer research/jobs panel  Come join us to hear about some of the work being done over the summers! Hear about what they did, and how they applied for and did their work. Ask questions to start thinking about what you might do next summer. 
12/7/20  Mingyue Wang, Incyte  On selecting the t best Bernoulli Treatments 
In many situations we are faced with the problem of choosing among several alternatives. We may want to make a decision about which alternative(s) are the best. Considering a typical clinical trial setting, we set the goal of selecting among k ( > 0) experimental Bernoulli treatments the t (1 < t < k) best treatments provided that they are significantly better than the control. If fewer than t treatments are significantly better than the control, our goal is to retain the control. A fixedsamplesize procedure and a curtailed procedure are proposed to reach the goal. We adopt the twostage selection/testing approach considered by Thall, Simon, and Ellenberg (1988) in both procedures. Properties of the proposed procedures will be presented through theorems and numerical results. 
Scheduled Speakers, Spring 2020
Date  Speaker  Title  Abstract 

Feb 17, 2020  Xingye Qiao, Binghamton University  Data Science in Action: Setvalued Classification and Applications to Precision Medicine  Classification is a common machine learning task. Precision Medicine refers to selecting treatments that are most likely to help patients based on the patient's unique characteristics. In this lecture, I will talk about the fundamentals of classification, setvalued classification, and how the latter can be applied to achieve precision medicine. I will also talk about the research and education development of data science programs at Binghamton University. No particular knowledge is needed for the talk though knowledge of probability theory and some linear algebra will be helpful. 
March 2, 2020  Megan Martinez  Crocheting Mathematics  Crocheting is a process that turns yarn into fabric. It has been used for centuries to painstakingly create oneofakind fabrics and clothing. More recently, the art of crochet has been used to create physical models of mathematical structures, such as hyperbolic planes, spheres, and manifolds. This provides us a tactile (and crafty!) way to engage with mathematics; indeed, the very process of making a crochet pattern requires a deep understanding of the model you are constructing. In this talk, we will give an overview of different ways crochet has been used to make models, and then dive specifically into how we can construct patterns for volumes of revolution (the ones from Calc II!). 
April 20, 2020  Stan Seltzer, by zoom  click here  Gerrymandering  Every ten years the United States conducts a census, after which the 435 seats in the House of Representatives are apportioned to the states. The final step in all but the very smallest states that are entitled to one representative is the process of dividing each state into the appropriate number of congressional districts. (State, county, and municipal districts may also have to be redrawn.) When districting is done in a way intended to establish an unfair political advantage for a particular party or group by manipulating district boundaries, it is known as gerrymandering.
This brief introduction, based on the gerrymandering unit in Math, Fairness, and Democracy (MATH 16400), will include redistricting principles, gerrymandering strategies, historical and legal background, and some topics that are more mathematical: winner’s bonus, partisan symmetry, efficiency gap, and measures of compactness. Also lots of pictures and quotes. 
Scheduled Speakers, Fall 2019
Date  Speaker  Title  Abstract 

Sept 16, 2019  Dave Brown  American Revolutionary and Civil War Cryptography 
“One if by Land Two if by Sea” This line from Longfellow’s poem describes a secret signal to the patriots about approaching British troops and goes on to commemorate Paul Revere’s Midnight Ride. At the same time, the poem reveals that Revere served as a spy and that the colonists engaged in early attempts at cryptology — sending, receiving, and decoding secret messages. We will explore the role that spycraft and cryptology played in the American Revolution and in the U.S. Civil War. 
Sept 30, 2019  Molly Noel and Jamie Woodworth  Summer Research  Molly and Jamie will share their experiences from their summer research. 
Oct 14, 2019  Ted Galanthay 
Shall we play a game? Hawks, Doves, and More 
In the 1960's, ecologists began to use game theory to study evolutionary questions on topics such as animal aggression, the sex ratio, and altruism. Further study led to the creation of evolutionary game theory. In contrast to traditional game theory, evolutionary game theory seeks to describe changes in the frequency of strategies over repeated iterations of a game. Typically, the number of players in the game is fixed. In this talk, I will describe recent efforts to integrate population dynamics and evolutionary game theory models to answer questions about the evolution of animal aggression. 
Oct 28, 2019  Math Department  Preview of Spring Courses  Join the department to hear about the courses being offered in the spring! 
Nov 11, 2019  Josh Hayden and Heetisha Inderjeet  Two Part Talk On Mathematics and Community 
Part 1: Data and Donations, Joshua Hayden A talk on using data to help project donations and find top donor prospects for the Ithaca State Theatre. How data analysis and machine learning can be put to work in the nonprofit space to help communities. Part 2: Application of Math in Real Life, Heetisha Inderjeet As a math major, people sometimes expect that the only career goal is to teach. However, math can be a career in different ways. This project which involves working with Matthew LeRoux from the Cornell Cooperative Extension (Tompkins County) is a good example. This project consists of working with the cooperative extension partner to evaluate a meat pricing calculator and drill down on significant statistical numbers which will be able to be used for workshops and grant writing. 
Dec 2, 2019  Xingye Qiao, Binghamton University  Postponed due to snow 