William A. Cherry

Associate Professor of Mathematics

University of North Texas


Office Hours

Fall 2017

Office Location: General Academic Building (GAB) 405.
Office Hours:  Mondays 12:30-1:30
 Tuesdays & Thursdays 1-3
 Wednesdays 9:30-10:30, 12:30-1:30, and 4-5
 and by appointment

Contact Information

E-mail:  wcherry@unt.edu

Phone:  (940) 565-4303

Fax: (940) 565-4805
Mailing Address: Department of Mathematics
University of North Texas
1155 Union Circle #311430
Denton, TX  76203-5017
Delivery Address: Department of Mathematics
General Academic Building, Room 435
University of North Texas
225 S. Avenue B (Avenue B at Mulberry)
Denton, TX  76203


Fall '17 Courses

Math 2730 -- Multivariable Calculus
Section 003 Meets TR 3:30-4:50 in CHIL 245.
Section 003 Final Exam: Tuesday, December 12, 1:30-3:30 in CHIL 245.
Section 004 Meets TR 5:00-6:20 in PHYS 104.
Section 004 Final Exam: Tuesday, December 12, 5-6:20 in PHYS 104.
Math 3740 -- Vector Calculus
Class Meets MW 2-3:20 in WH 216.
Final Exam: Monday, December 11, 1:30-3:30 in WH 216.
Math 6620 -- Algebraic Topology
Class Meets MWF 11-11:50 in GAB 461.
Final Exam: Monday, December 11, 10:30-12:30 in GAB 461.

Research Interests

I have done work that can be considered complex analysis, number theory, and algebraic geometry. I am especially interested in connections between rational solutions and functional solutions to systems of algebraic equations. For instance, consider the equation of the unit circle, x2+y2=1. This equation has many rational solutions, such as (3/5)2+(4/5)2=1, coming from Pythagorean triples. The unit circle equation also has the "functional solution" (sin t)2+(cos t)2=1. On the other hand, if n>3, then xn+yn=1 has only a few rational solutions (this is Fermat's Last Theorem/Weil's Theorem or the Mordell Conjecture/Faltings Theorem, depending on what one means by "few" and "rational"). Similarly, xn+yn=1 has no non-constant "entire function" solutions -- this follows easily from, for instance, the Uniformization theorem. One area I often work in is a field called "p-adic" analysis. Working with functions of p-adic numbers is sort of halfway in between algebra and analysis, so the idea is it might help us understand how functional solutions are related to rational solutions. Another area I work in is Nevanlinna theory, which extends the Fundamental Theorem of Algebra to meromorphic functions. Finally, I have research interests in classical complex analysis, particularly using geometric methods to better understand various inequalities.

Graduate Advising

If you are a UNT mathematics graduate student looking for an advisor and are considering asking me, here is some basic information.


  click here for a list of my publications or click here to find my preprints on the arXiv.
Click here to see my author profile in Mathematical Reviews.

Click here to see my citations according to Google Scholar.

Look me up in the Mathematics Genealogy Project.

Conferences and other programs I will be attending

 Nevanlinna theory and Diophantine approximation, Tuan Chau, Vietnam, June 22-25, 2017.
 The 25th International Conference on Finite or Infinite Dimensional Complex Analysis and Applications, Hong Kong, June 26-30, 2017.
 Summer Meeting, University of Science, Ho Chi Minh City, July 22-23, 2017
 Numbers, Functions, Transcendence, and Geometry, Fall Central Section Meeting of the AMS, Denton, TX, September 9-10, 2017
 Resonances of complex dynamics, International Center for Mathematical Sciences, Edinburgh, UK, July 9-13, 2018
 Joint International Meeting of the American Mathematical Society and the Vietnamese Mathematical Society, Quy Nhon, Vietnam, June 10-13, 2019

Other upcoming conferences/meetigs

 Joint International Meeting of the American Mathematical Society and the Chinese Mathematical Society, Fudan University, Shanghai, China, June 11-14, 2018
 p-Adic Analysis & Dynamical Systems, Poznan University of Technology, Poznan, Poland, July 9-13, 2018


Educational/Professional History

  click here for a brief description of my educational and professional background

Maple Tutorial

Click here for a brief introduction to the computer algebra system Maple


Fun and Games

Click here to generate some "fractal" graphics associated with Newton's method.



Beautiful Numbers, by John R. Swallow [American Scholar 64 (1995)]: A delightful essay written by a graduate school colleague of mine about his transformation from a first-year graduate student to a successful mathematician and scholar. I recommend this essay to new graduate students struggling with deciding what to study, who to choose as an advisor, and finding one's personal mathematical aesthetic.
Ludic Proof: Greek Mathematics and the Alexandrian Aesthetic, by Reviel Netz [Cambridge, 2009]: A book I am looking forward to reading about the literary qualities of mathematics and commonalities between writing mathematics (which I mostly understand) and writing poetry (which I mostly don't understand, but admire nonetheless).

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