Department of Mathematics

Daphne et alDaphne Liu (center) with her (current and former) students, Minh Vu (now at UCR), Joyce Quon, Angel Chavez and Mason Shurman (now at UCI). See below for the latest news on Daphne Liu's publications with her students.

The Math Department office is closed indefinitely because of the pandemic.

All communication will be done by email or Zoom (email advisor to set up zoom appointment):

It's Summer! The advisors may be unavailable,  so it is a good idea to cc the chair on your emails to advisors.


The Math Department announces its 2021 Outstanding Student Awards!


Joycs QuonJoyce Quon: Joyce has a perfect 4.0 GPA. She did her Honors Thesis with Daphne Liu on coloring problems in graph theory. Among her many other activities, she did an REU at Michigan State University in 2019, a JPL summer internship in 2020, and was
a Cal State LA Delegate to the Annual CSU Student Research Competition this year. She has been supported by an Edison CSU-SETM-NET scholarship, the NASA Direct STEM program and the NSF PUMP program.


Jonathan Cervantes: Jonathan has straight As in all his MS courses and in two comprehensive exams, and graduated this term.  He has been working with Mike Krebs on a project on the chromatic numbers of certain graphs. Mike Krebs writes "Jonathan's contributions to the project have been top-notch, both in terms of the mathematics itself as well as mathematical writing. We are on the verge of sending off a paper in which we write up the results."

Louis Diaz: Louis is finishing up his MS thesis with Jose Mijares on topology. Mijares wrote “Louis was outstanding. His mathematical capacities are excellent. He is a very mature original thinker who likes to be challenged. His discipline and his capacity to work independently are impressive.” Among other accomplishments he received an outstanding poster award at the Cal State LA Annual Student Symposium on Research in March.

MJ LeeMyeongjin Lee: Myeongjin is another student with a perfect record - a GPA of 4.0 and As in two comprehensive exams. Here is Mike Krebs' recollection of Myeongjin's presentation in Math 5500: "I still remember MJ’s talk.  It was meticulous, impeccably organized, and thoroughly thought-through.  She not only applied techniques learned in the class to the problem but also her own cleverness and outside-the-box thinking to obtain even better results."

Keun ParkKeun Park: Has GPA of 4 in his MS program. He just got As in both comprehensive exams and has now graduated. Vladimir Akis wrote about Keun's work in a topology course, "Keun was truly outstanding in that course, and he performed far above the rest of the students (who were all graduate students).  It was a pleasure to have Keun in my classes.”  When he was an undergraduate at our school, Keun received the 2019 Outstanding Senior Award from our department.    



Just Published: 

A. Chavez, D. Liu, and M. Shurman,   Optimal Radio-k-Labeling for Trees, European Journal of Combinatorics, Vol 91 (2021).    

D. Liu, L. Saha, and S. Das, Improved Lower Bounds of the Radio Number for Trees, Journal of Theoretical Computer Science, Vol 851 (2021), 1-13.  

The channel assignment problem has been studied extensively in the past three decades. The task is to use graphs as models to assign channels to cities or transmitters such that interference is avoided and the spectrum of the channels used is minimized. Both publications are about the radio labelings of graphs, a topic motived by the channel assignment problem. One of the publications was a joint work of Daphne Liu and her research students Angel Chavez and Mason Shurman (who was 14-yr old when the paper was submitted). This is Angel’s second publication with Liu.  Angel is currently a master student and will enter the math Ph.D. program at U. Minnesota in Fall 2021. Mason is currently a student at UCI. This was his first publication, from which Mason’s Erdös number becomes finite.

Daphne Liu is a graph theorist. Besides many types of channel assignment and graph coloring problems, her research interests also include topics related to number theory and algebraic topology.  


Keun Park and Parker Le will be going to UCLA this summer for the CSU-UCLA Summer Bridge Program. The goal of the program is to prepare CSU students for PhD study. More...