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Image of  Titu  Andreescu
 Contact InformationHelpHelp  
Titu Andreescu
Associate Professor-Science/Math Education
Office MailstopMail Box: FN33, FN 3.308, Room No.: FN3308 
Email Address    Primary Phone Number 972-883-2437    Media Contact
Administrative Assistant:  Help  
Kinnon, Tommie L
 Professional Preparation
 Ph.D.MathematicsUniversity of West Timisoara, Romania2003
 B.A.MathematicsUniversity of West Timisoara, Romania1980
 M.S.MathematicsUniversity of West Timisoara, Romania1980
Collapse Section Expand Section Research and Expertise
Research Interests

1. Enhancing students' interests and skills in mathematics.
I am the Director and Founder of AwesomeMath, which includes a summer program for students training to succeed at the Olympiad level, a correspondence-based lecture series for students' continuing education, called AwesomeMath Year-round, and Mathematical Reflections, a free online journal focused primarily on mathematical problem solving. The main purpose of this initiative is to give students an opportunity to engage in meaningful learning activities and explore in detail areas in advanced mathematics. AwesomeMath's primary focus is on problem-solving. I use it as a tool to enhance students' interest and skills in mathematics.

I believe that there are two major parts in significant mathematics teaching and learning: higher concepts (introducing and developing new topics) and applying those concepts creatively to concrete problems (bringing life to the new topics). These two areas rely on each other, but we focus primarily on the latter. I feel that certain advanced mathematics topics are best introduced to young students by motivating the concepts through problems that encourage investigation. 

I am actively involved with mathematics competitions at the secondary and undergraduate levels.  I write and contribute questions for the American Mathematics Competitions examinations as well as the International Mathematics Olympiad and the W. L. Putnam competition. 

I would like to involve undergraduate students in my research.  My area of research is an ideal entrance point to research for talented students, since it does not require a lot of background while offering abundance of open problems.  In addition to the problems I can suggest, the students can also easily make their own conjectures, experiment by using Computer Algebra Systems, attack special cases, generalize and transfer ideas from one case to another, and learn and use various techniques while trying to resolve the problems.  Thus they would experience first hand all the phases and subtleties of doing original research.

2. Diophantine Analysis, with emphasis on Quadratic Diophantine Equations.
 This research area focuses especially on the study of the general Pell's equation, which is connected to problems from various domains of mathematics and science, such as Thue's Theorem, Hilbert's Tenth Problem, Euler's Concordant Forms, Einstein's Homogeneous Manifolds, Hecke Groups, and so forth.  I have obtained numerous original results such as:  

  1. In the cases when the equation is solvable, I found an elegant explicit form for the solutions.  I then extended a result of D. T. Walker [The American Mathematical Monthly, vol. 74, no. 5, 1966, 504-513].
  2. I proved partial results about the equation  and formulated conjectures regarding its solvability.
  3. I obtained results about the equation , including those regarding the LMM algorithm of finding the fundamental solutions to the general Pell's equation based on continued fractions.
  4. I devised two original methods of solving the equation .
  5. I proved that numerous important quadratic equations have infinitely many solutions in integers.

I devoted special attention to the Diophantine representability of several interesting sequences of positive integers.  I introduced the concept of r-Diophantine representability of a sequence of positive integers and studied in an original manner the equations  by employing the special Pell's equation .  I have extensively studied the Diophantine representability of the Fibonacci, Lucas, and Pell sequences using methods of investigation different from and simpler than the ones already found in the literature.  I also studied the problem of Diophantine representability of generalized Lucas sequences, which I introduced, finding conditions under which their general solution is a linear combination with rational coefficients of the classical Fibonacci and Lucas sequences. 

I found numerous applications of the results above.  For example, I determined conditions under which the numbers  and  are simultaneously perfect squares for infinitely many positive integers n.  I discovered special properties of triangular numbers, such as proving that any positive rational number r, where is irrational, can be written as the ratio of two triangular numbers.  I extended some results pertaining to triangular numbers to polygonal numbers.

Collapse Section Expand Section Publications
 1  2 3 4 5  
  YearPublication  Type
T. Andreescu, W. Stromquist, Z. Sunik, Bandwith Reduction in Rectangular Grids. Discrete Mathematics, accepted
Category: Discrete Mathematics
Peer reviewed
T. Andreescu, On a Class of Diophantine Equations, American Mathematical Monthly, submitted
Category: American Mathematical Monthly
Peer reviewed
T. Andreescu, D. Andrica, On the Diophantine Equations XZ + my + WZ Z i 1, The Fibonacci Quarterly, submitted
Category: The Fibonacci Quarterly
Peer reviewed
T. Andreescu, D. Andrica, Diophantine Representations of Some Generalized Lucas Sequences, The Fibonacci Quarterly, submitted
Category: The Fibonacci Quarterly
Peer reviewed
T. Andreescu, O. Muskarov, L. Stoyanov, Minima and Maxima in Geometry, Birkhauser Boston, 2005, 264 pp.
Collapse Section Expand Section Presentations and Projects
  1  2 3 
Start DateEnd DatePresentation/Project
2005 2005 Seminario de Educacion Matematica lberoamericano con `Enfasis en solucion de Problemas
Seminario de Educacion Matematica lberoamericano con `Enfasis en solucion de Problemas, Cartagena, Colombia
2005 2005 Math Time
Inivited lecturer at Math Time, Voineasa, Valcea, Romania, 2005
1996 2000 Worked with Columbian and Peruvian students training for the IMO at Antonio Narino University in Bogota, Columbia
Worked with Columbian and Peruvian students training for the IMO at Antonio Narino University in Bogota, Columbia for a week in each of five years from 1996 through 2000
12/1998 12/1998 Mathematical Induction, an Elegant and Powerful Method
University of South Wales in Sidney, Australia
09/1999 09/1999 Consultant to the Iberoamerican Mathematics Olympiad in Puerto Plata, Dominican Republic
Collapse Section Expand Section Appointments
DurationRankDepartment / SchoolCollege / OfficeUniversity / Company
2005-PresentAssociate ProfessorScience/Mathematics Education DepartmentScience/Mathematics Education DepartmentUniversity of Texas at Dallas (UTD), Richardson TX
1998-2003DirectorMathematical Association of America (MAA) American Mathematics Competitions (AMC) University of Nebraska-Lincoln (UNL), Lincoln, NE
1991-1998Mathematics Teacher  Illinois Mathematics and Science Academy (IMSA), Aurora, IL
1980-1990Mathematics Teacher  Loga Academy, Timisoara, Romania
08/2003-12/2004Visiting Scholar  University of Wisconsin-Whitewater (UWW), Whitewater, Wl
05/2003-07/2003Visiting Scholar  Tokai University, Tokyo, Japan
2000-2002MAA American Mathematics CompetitionsAkamai Technologies$600,000Previous
1999-2002MAA American Mathematics CompetitionsU.S. Office of Naval Research$162,835Previous
2000-2001MAA American Mathematics CompetitionsU.S. Army Research Office$50,000Previous
       Teaching HelpHelp  
 Additional Information
Other Student Activities

1995-2002 Director of the Mathematical Olympiad Summer Program (MOSP) and Leader of the US delegation to the IMO. In addition to MOSP teaching responsibilities, oversaw the work of the other instructors and closely supervised their teaching.

1994-2002 Head Coach of the USA Mathematical Olympiad Team. Led the US team to its historic lst place in 1994 when all six American students achieved perfect scores, unique performance in the 45-year history of the IMO. Led Team USA to 2"d place in 1996 and 2001, and 3rd place in 1998, 2000, and 2002 in a field of more than 80 participating countries.

1993-1999 Grading room chair of American Regions Mathematics League (ARML)

1993-1994 and 2003—Present Assistant Coach of the USA IMO Team

1991-1998 Coach of the Chicago Area All-star Mathematics Team

1991 -1998 Co-sponsor of the IMSA chapter of Mu Alpha Theta

1983-1989 Counselor, Romanian Ministry of Education. Designed and implemented specialized programs to optimize the education of gifted middle and high school students, involving close interaction with university professors and senior teachers associated with Romania's best secondary schools. Assistant Coach of the Romanian Mathematics Olympiad Team and Deputy Leader of the Romanian Team for the Mathematical Contest of the Balkan Countries and the IMO.

Academic Honors/Awards
2001-2003 On the list of MAA lecturers. The MAA has a program whereby each MAA section may invite at the MAA's expense one speaker from the list to lecture at their annual section meeting.

1995 Certificate of Appreciation Presented by President of the MAA for "Outstanding service as Coach of the USA Mathematical
Olympiad Program in preparing the USA Team for its perfect performance in Hong Kong at the 1994 IMO".

1994 First place winner of Edith May Sliffe Award for Distinguished High School Mathematics Teaching, awarded by President of the MAA.

1983 Distinguished Teacher Award bestowed by the Romanian Secretary of Education.

Membership in Professional Societies
  • American Mathematical Society, since 1995
  • Mathematical Association of America, since 1994
  • National Council of Teachers of Mathematics, since 1992
  • American-Romanian Academy, since 2002

Other Professional Activities
  • 2002-Present Consultant and reviewer for Birkhauser Boston
  • 1999-Present Consultant for Best Practices in Ea'ucation (BPE). BPE gives US teachers and researchers opportunities to identify, adapt, and disseminate exemplary practices and curricula from abroad.
  • 1997-1999 Co-authored (with Mark Saul) the problem solving column in Quantum, a quarterly mathematics journal for high school/college students and professionals
  • 1993-1996 Authored monthly Problem Solving Column in the Illinois Mathematics Teacher Journal
  • 1993-1995 Editor of [MSA Mathematics Journal
  • 1986-1989 Secretary of the Romanian Mathematical Society, Timisoara
  • 1981-1989 Editor—in-chief of Timisoara's Mathematical Gazette, Romania's mathematics journal with the second largest circulation

Other Student Activities
  • Hotchkiss School, Lakeville, CT, 2005
  • MAA Sectional Meeting, Arlington, TX, 2005
  • Mathematical Sciences Research Institute, Berkeley, CA, 2004
  • University of Puget Sound, WA, 2003
  • University of Colorado, Colorado Springs, CO, 2002
  • MathPath, Black Hills State University, Spearfish, SD, 2002
  • University of California at Los Angeles, CA, 2002
  • Texas Tech University, TX, 2002
  • MAA Sectional Meeting, Ripon, WI, 2002
  • Ohio University, Athens, OH, 2002
  • Phillips Exeter Academy, NH, 2002
  • Hunter College, NY, 2002
  • Stuyvesant High School, NY, 2002
  • University of South Alabama, AL, 2001
  • Colby College, ME, 2001
  • Brooklyn Tech High School, NY, 2001
  • Academy for Advancement of Science and Technology, NJ, 2001

Recent Committees
  • 2001-2002, On the three-member panel of question writers for the W. L. Putnam
  • 2004-Present Mathematical Competition, the premier collegiate-level mathematics contest in North America
  • 2003-Present Member of the IMO Advisory Board, the goveming body of the International Mathematical Olympiad
  • 2003-2004 Discussion Leader of Problem Solving Section at 10th Intemational Congress of Mathematics Education (ICME), Copenhagen, Demnark
  • 2002-Present Member of the Editorial Board, Acta Universitatis Apulensis-Mathematica, "l December l9l8" University, Alba Iulia, Romania
  • 2002-Present Secretary of the Asian-Pacific Mathematics Olympiad
  • 1999-Present Leader of International Project in Problem Solving sponsored by Best Practices in Education. This project involves curriculum writing and interaction with teachers from the USA, Bulgaria, Romania and Hungary. Chaired, to date, four International workshops
  • 1999-2000 Chaired Mathematics Competition Section at 9th International Congress of Mathematics Education (ICME), Makuhari, Japan
  • 1996-2004 Chaired USAMO Committee, restructuring the contest to more closely
  • resemble the IMO in format

Dr. Tom Butts
School of Natural Sciences and Mathematics
University of Texas at Dallas
Richardson, TX 75080

Dr. Jonathan Kane
Department of Mathematical and Computer Sciences
University of Wisconsin - Whitewater
Whitewater, W1 53190-1790

Dr. Ken Ono
Solle P. and Margaret Manasse Professor of Letters and Science
Department of Mathematics
University of Wisconsin
Madison, Wisconsin 53706

Dr. Zoran Sunik
Department of Mathematics
Texas A&M University
College Station, TX 77843-3368

Dr. Dorin Andrica
Faculty of Mathematics and Computer Science
Babes-Bolyai University
Str. Kogalniceanu l
Cluj-Napoca, Romania
0l l-402-64-215956

Dr. Steven Condie
Illinois Mathematics and Science Academy
l500 W. Sullivan Road
Aurora, IL 60506

Dr. Razvan Gelca
Texas Tech University
Lubbock, TX 79409

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