# Department of Mathematics

# News

- CCNY visits Stony Brook (04/23/2018)
Math majors from CCNY visited Stony Brook University for their second annual Math Day. There were numerous talks about maze construction, sphere packings, geometry of black holes, and introductions to singularities. Thank you to Prof. Christian Schnell and the math department at Stony Brook University for putting together a wonderful event!

- Prof. Chinta - Editor of the Journal of Number Theory (04/19/2018)
Congratulations to Prof. Gautam Chinta, who has been named an editor of the Journal of Number Theory!

- Prof. Steinberg - Fullbright scholar (04/19/2018)
Congratulations to Prof. Steinberg! He has been awarded a 2018-19 Fullbright U.S. Scholar grant to go to Brazil (Universidade Federal de Santa Catarina) for four months.

- University of Minnesota (04/18/2018)
Congratulations to Yorkinoy Shermatova for being accepted to the University of Minnesota with funding for their PhD program. She will be joining two other recent CCNY Graduates, Maria Sanchez and Chen Shi.

## Hear about Yorkinoy's Story

After receiving my BS from Samarkand state university ( Samarkand, Uzbekistan) I worked as a research assistant there. In 2015, I got accepted for the MS in Mathematics program of CCNY. I truly enjoyed wonderful lectures from faculty members and made a lot of friends here. This place actually helped me realize that I might have a chance in academia in future. One of the schools I applied for PhD program was University of Minnesota. I was very delighted when I got an offer since I heard a lot of great things from my friends Maria Sanchez and Chen Shi (graduates of CCNY, current PhD students of UMN).

I am very grateful to the faculty and staff of Math department of CCNY since I had a great experience as a student and an adjunct here.

I want to thank Prof. Bak, Prof. Santoro, Prof.Steinberg, Prof. Flatto, Prof. Bou-Rabee for amazing lectures. I would also like to thank Prof.Ocken and Prof.Auth for helping me grow as an adjunct lecturer. I also want to thank Jason Redman and George Brathawaite for being there all the time whenever I needed help.

I will miss CCNY and will do my best to be a good representative of this school at UMN.

- Miami University SUMSRI (04/13/2018)
Congratulations to Vincent Filardi for being accepted into the Summer Undergraduate Mathematical Sciences Research Institute (SUMSRI) at Miami University for 6 weeks, expenses fully covered! He is one of eight students selected for the program. Continuing the trend of CCNY students applying to summer programs, he will be studying dynamical systems.

## Hear about Vincent's story

I chose this program because due to its GRE prep, a chance participates in rigorous mathematical research, and to network within mathematics outside of the CCNY sphere. I was also given an offer for WPI’s REU, but it was much more concerned with industrial math.

My advice to other students is to prepare earlier unlike I did and apply to as many REU’s and hope for the best and prepare for the worst.

As a transfer student form Norwalk Community College and only 2 semesters at CCNY I am extremely fortunate to participate in Miami’s 2018 SUMSRI. My intent at the SUMSRI is to utilize its resources to enrich my passion and to turn my curiosity into a career in academia. I would like to thank all the people that helped me in the process: Professor Daupern, Professor Karnowski, Professor Hanson, Professor Santoro, Dr. Vanessa Morest, Jeffrey Bettz and my girlfriend Maddy Vose. ”

Also, in the spirit of diversity of CCNY I am a first-generation college student.

For more information on the SUMSRI, click here.

- University of Houston Dynamics (04/10/2018)
Congratulations to two of our undergraduates, Casey Bolles and Pavel Javornik! They were accepted to the University of Houston's Summer School on Dynamical Systems, expenses fully covered! The Department of Mathematics at University of Houston will host the sixth annual Houston Summer School on Dynamical Systems from May 16-24, 2018. The school will use short lecture courses, tutorial and discussion sessions, and student projects to explore various topics in dynamical systems.

For more information, click here

- CUNY Math Challenge (03/06/2018)
Sponsored by the Office of Executive Vice Chancellor and the CUNY Institute for Software Design and Development (CISDD) and supported by the Office of the Chancellor, the CUNY Math Challenge seeks to identify and reward CUNY's best math talent. Regardless of your major, if you are a matriculated CUNY undergraduate student and enjoy doing math problems, the CUNY Math Challenge is for you! There are stipend awards in the final round.

Here's how it works. The contest begins on-line at 9:00 A.M. on Monday, March 12, 2018 and is composed of two rounds with questions of varying difficulty. The first round will take place entirely online, remain open for two weeks, ending on March 25. The second round is in-person by invitation only is on Sunday, April 15, 2018 10am-noon. Invitations will be by email. This round determines the winners, who will be notified by email. A celebration for the winners will take place in mid-May. Winners will receive a stipend worth between $100 and a top prize of $1,000. Up to $6,000 will be awarded to the winners.

So, are you up for the challenge?!

Click here for more information or visit https://math.cisdd.org/

- NYC Regional Math Alliance (02/02/2018)
We are proud to announce the NYC Regional Math Alliance! The goal of the NYC Math Alliance is to carry out the mission of the National Math Alliance in the New York City Metropolitan Area. Our goal is simple: we want to be sure that every underrepresented or underserved American student with the talent and the ambition has the opportunity to earn a doctoral degree in a mathematical science.

For more information, click here.- Tai Danae-Bradley on PBS (12/05/2017)
CCNY graduate, Tai Danae-Bradley, is cohosting a youtube channel called “PBS Infinite Series”. She finished her undergraduate degree at CCNY in 2014 and is currently working on her Ph.D. at the CUNY Graduate center. For more details, click on the image below.

- Meet Julia Saccamano! (07/06/2017)
Meet one of our undergraduate students and summer research interns, Julia Sacamano!

Over the summer I will be studying Game Theory under the direction of Professor Akin. I will be using my experience with probability theory and linear algebra to understand the nature of games. The theory, first introduced by mathematician John von Neumann and economist Oskar Morgenstern in the 1940s, is the branch of mathematics which addresses situations in which there is conflict, competition, and potential strategies between rational thinking human ‘players’. We can see its uses in economics, politics, philosophy, and psychology. I will be focusing the majority of my studies on both two-person zero-sum games and two-person nonzero-sum games. Through these studies I will be taking a look at topics such as utility theory, payoff matrices, and Nash equilibrium in hopes of better understanding how to discern ‘solutions’ to games or predict potential outcomes of these situations. I will be reading Game Theory and Strategy by Philip Straffin, The Evolution of Cooperation by Robert Axelrod, and Game Theory: A Nontechnical Introduction by CCNY Emeritus Professor Morton D. Davis.I will be using this knowledge to further examine the classic paradox of the Prisoner’s Dilemma which was originally proposed by Merrill Flood and Melvin Dresher as well as the iterated (repeated play) version. I am an Applied Mathematics major and will begin my Junior year in the fall. I hope to relate my studies in game theory to classes I've taken at CCNY, such as Probability Theory, Linear Algebra, Philosophy, and Economics, as well as things in everyday life. I love challenges, puzzles, and problems that come with studying math and am forever chasing the feeling of satisfaction when I find a solution and truly understand a topic. I love the universal and dynamic aspects of math and how it is the same in every country around the world, how it is used in every facet of life, and how its presence might not be noticed a first glance.

- Meet Minwoo Bae! (06/21/2017)
Meet one of our graduate students and summer research interns, Minwoo Bae!

This Summer I am going to continue the work on developing algorithms to solve computational problems in the field of Mathematical Neuroscience under the supervision of Professor Amarasingham. His laboratory is currently engaged in the development and application of tools for inferring neuronal connectivity maps from extracellular spike data obtained from electrophysiological brain recordings in in vivo conditions. This is in collaboration with G. Buzsaki’s experimental lab at NYU. There are many mathematical challenges, ranging from the development of biophysical models to the development of nonparametric spike train analysis tools. Regarding the latter, some of the major obstacles are computational. A theory is in place for performing connectivity inference, drawing from previous tools developed in the laboratory, but at current data scales the computational costs are prohibitive. My summer research aims for developing algorithms to accelerate these computations. There are two principal approaches I will pursue. The first will involve accelerating the computation of distributions of sums of random variables, in the style of the fast Fourier transform (FFT), and related tools. The challenge is accommodating nontrivial dependency structures (expressed as graphs; so-called “graphical models”) among these random variables. I will research approaches to handling these elaborations. A second approach is to use asymptotic approximations. I will research the literature to see what bounds are available, adapting them as necessary, to justify and combine asymptotic approximations. I will apply the ideas developed in these investigations to in vivo neurophysiology data, in the context of the laboratory’s other work.

Since 2011, I had been working as a software developer in Manhattan. Since I designed and developed several web applications for a HIV research team, I naturally gained interest in how a disease is transmitted though a network. In 2014, I had the honor of being selected as Young Talent in the Field of Software by the South Korean government, which provided me with a fund for advanced study of mathematics and computer science. I used the fund for some graduate-level coursework in computer science to study random processes on a network. During this part-time student experience, I realized that without the advanced mathematical foundation, it would be very difficult to proceed much further in this kind of studies. This led to my decision to fully return to school to pursue studying Mathematics since 2015. Now in 2017, I am very excited by the fact that it is possible to tackle many technical challenges ranging from biology to artificial intelligence by using Mathematical concepts and techniques. This why I am passionate about Mathematics.- Haris Nadeem placed 8th in CUNY Math Challenge! (06/16/2017)
Haris Nadeem placed 8th in this year's CUNY Math Challenge. He will be receiving an award from CUNY central for placing in the top ten. He is a dual pure math and computer science major.

- Meet Pavel Javornik! (06/14/2017)
Meet one of our undergraduates and summer research interns, Pavel Javornik!

This summer I will be continuing my work under the mentorship of Dr. Patrick Hooper. Our current project is to describe the dynamical properties of geodesic flows on non-compact surfaces composed entirely of boundary unions of various polyhedrons. Certain characteristics of these infinite surfaces, such as the symmetries of the canonical forms of their quotient spaces, determine the behavior of geodesic flows given properties of said flow (such as their initial trajectories). The goal this summer is to adapt various methods used in studying infinite surfaces constructed from compact translation surfaces to better understand surfaces that might admit transformations of geodesic flows in the form of rotations. Much of the study of Veech surfaces is applicable to certain rational billiards problems on infinite surfaces like the Ehrenfest-Wind Tree Model, but these transformations often admit reflections off of boundaries in the form of perfectly elastic collisions. The translation surfaces and (consequently) Veech groups of these infinite surfaces have symmetrical properties unlike those of surfaces constructed of polyhedrons. Understanding how these boundaries might affect geodesic flow on flattened structures is key to understanding their dynamical properties.

What drives my work is my love for mathematics. Studying the underlying structures of objects such as manifolds fascinates me. With low-dimensional topology there is a geometric intuition when trying to characterize these kinds of surfaces. Describing the homology classes of non-compact, infinite (possibly infinite genus) surfaces in the form of their compact covering/translation spaces is a somewhat novel undertaking. There's an extraordinary number of possibilities in this realm of mathematics and they all begin with asking simple questions that begin to unravel the mysteries of the objects we study.- Two undergraduate students excel on the Putnam exam (05/15/2017)
The Putnam examination is a nationwide mathematics examination requiring exceptional ability and creativity to achieve a non-zero score. Two CCNY seniors, Allen Kim and Gautam Ramasubramanian, did exceptionally well, placing 408th and 813th nationwide. Congratulations to both, who will graduate in Spring 2017!

- 11 CCNY Mathematics students to begin doctoral programs with support (05/15/2017)
Eleven students finishing their MS degrees in Spring 2017 will begin doctoral programs in Fall 2017 with institutional financial support at a number of excellent institutions, including the University of Minnesota, the University of Waterloo, the University of Illinois, Arizona State University, Syracuse University, the CUNY Graduate Center, the University of Pennsylvania, and Stevens Institute of Technology.

The mathematics department congratulates all graduates!

- Professor Brooke Feigon receives the President's Outstanding Service Award! (05/09/2017)
Prof. Brooke Feigon is the recipient of the President's Outstanding Service Award. This award recognizes both the creativity and commitment of a full-time faculty member and the impact that s/he has had on student learning through a combination of innovative approaches in mentoring, research, teaching and/or scholarship. Awards will be made annually to up to three faculty members who have demonstrated extraordinary service to students, to scholarship and to the College. This award recognizes the importance of faculty participation in the governance of the institution and its significant impact on the College and the greater College community.