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Audrey Terras
Math. Dept., U.C.S.D.,
email address: aterras at ucsd.edu
Webpage updated January, 2019
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Books
Abstract Algebra with Applications,
Cambridge University Press, 2018
Abstract
Algebra with Applications provides a friendly and concise introduction to
algebra, with an emphasis on its uses in the modern world. The first part of
this book covers groups, after some preliminaries on sets, functions,
relations, and induction, and features applications such as public-key
cryptography, Sudoku, the finite Fourier transform, and symmetry in chemistry
and physics. The second part of this book covers rings and fields, and features
applications such as random number generators, error correcting codes, the
Google page rank algorithm, communication networks, and elliptic curve
cryptography. The book's masterful use of colorful figures and images helps
illustrate the applications and concepts in the text. Real-world examples and
exercises will help students contextualize the information. Meant for a
year-long undergraduate course in algebra for mathematics, engineering, and
computer science majors, the only prerequisites are calculus and a bit of
courage when asked to do a short proof.
Harmonic Analysis on Symmetric
Spaces—Higher
Rank Spaces, Positive Definite Matrix Space and Generalizations, 2nd Edition,
Springer, 2016.
This book gives an introduction to
harmonic analysis on symmetric spaces, focusing on advanced topics such as higher
rank spaces, positive definite matrix space and generalizations. It is intended
for beginning graduate students in mathematics or researchers in physics or
engineering. As with the earlier book entitled "Harmonic Analysis on
Symmetric Space—Euclidean Space, the Sphere, and
the Poincaré Upper Half Plane, the style is informal
with an emphasis on motivation, concrete examples, history, and applications.
The symmetric spaces considered here are quotients X=G/K, where G is a
non-compact real Lie group, such as the general linear group GL(n,R) of all n x n non-singular real matrices, and K=O(n),
the maximal compact subgroup of orthogonal matrices. Other examples are
Siegel's upper half "plane" and the quaternionic
upper half "plane". In the case of the general linear group, one can
identify X with the space Pn of n x n
positive definite symmetric matrices.
Many corrections and updates are
included in this new edition. Updates include discussions of random matrix theory
and quantum chaos, as well as recent research on modular forms and their
corresponding L-functions in higher rank.
Many applications have been added, such as the solution of the heat
equation on Pn, the central limit theorem
of Donald St. P. Richards for Pn, results
on densest lattice packing of spheres in Euclidean space, and GL(n)-analogs of the Weyl law for eigenvalues of the
Laplacian in plane domains, as well as computations of analogues of Maass waveforms for GL(3).
Topics featured throughout the
text include inversion formulas for Fourier transforms, central limit theorems,
fundamental domains in X for discrete groups Γ (such as the modular group GL(n,Z) of n x n matrices with
integer entries and determinant ±1), connections with the problem of finding
densest lattice packings of spheres in Euclidean space, automorphic forms, Hecke operators, L-functions, and the Selberg
trace formula and its applications in spectral theory as well as number theory.
A movie related to this book showing
the projection of (t,v,x1,x2,x3) onto the
x-coordinates in the Grenier fundamental domain (see
page 151 of the old edition) for
GL(3,Z) acting on the determinant one surface in positive 3x3 matrix space as
the coordinates (t,v) travel along t=v from .9 to 1.03.
http://math.ucsd.edu/~aterras/grenier.htm
Harmonic Analysis on Symmetric
Spaces—Euclidean Space, the Sphere, and the Poincaré Upper Half-Plane, 2nd
Edition, Springer, NY, 2013
The 2nd edition includes
corrections, new topics, and updates. It
is intended for beginning graduate students in mathematics and statistics, or
researchers in physics or engineering.
The prerequisites are minimized and the style is informal, with emphasis
on motivation, concrete examples, history and applications in mathematics,
statistics, physics, and engineering.
Topics include: inversion formulas for Fourier transforms, the Radon
transform, NonEuclidean geometry, Poisson's summation
formula, fundamental domains for discrete groups, tessellations of symmetric
spaces, special functions, modular forms, Maass wave
forms, the Selberg trace formula, finite analogues of symmetric spaces. Applications include: the central limit
theorem, CAT scans, microwave engineering, the hydrogen atom, expander graphs,
crystals and quasicrystals, wavelets, modular knots, L-functions, zeta
functions, spectral theory of the Laplacian.
A movie related
to Volume I showing a big bang related to points in the fundamental domain of
the modular group Γ=SL(2,Z), which are Γ-equivalent to points on a
horocycle moving down toward the real axis.
The y-axis has been distored so that infinity is at height 10.
http://math.ucsd.edu/~aterras/bigbang.htm
The Old
Editions.
Harmonic Analysis on Symmetric
Spaces and Applications, Vols. I, II, Springer-Verlag, N.Y., 1985, 1988.
Volume 1 gives an introduction to
harmonic analysis on the simplest symmetric spaces - Euclidean space, the
sphere, and the Poincaré upper half plane H and fundamental domains for
discrete groups of isometries such as SL(2,Z) in the
case of H. The emphasis is on examples, applications, history. The intention is
to be a friendly introduction for non-experts.
Volume 2 concerns higher rank
symmetric spaces and their fundamental domains for discrete groups of
isometries. Emphasis is on the general linear group G=GL(n,R) of invertible nxn real
matrices and its symmetric space G/K which we identify with the space Pn
of positive definite nxn real symmetric matrices.
Applications in multivariate statistics and the geometry of numbers are
considered.
Chapter Contents
Volume I
Chapter 1
Distributions or generalized
functions Fourier integrals Fourier series and the Poisson summation formula Mellin transforms, Epstein and Dedekind zeta functions
Chapter 2
Spherical Harmonics O(3) and R3. The Radon transform
Chapter 3
Hyperbolic geometry Harmonic
analysis on H Fundamental domains for discrete subgroups G of G=SL(2,R) Automorphic forms - classical Automorphic forms- not
so classical - Maass wave forms Automorphic forms and
Dirichlet series. Hecke theory and generalizations
Harmonic analysis on the fundamental domain. The Roelcke-Selberg
spectral resolution of the Laplacian, and the Selberg
trace formula.
Chapter Contents
Volume II
Chapter 4
Geometry and analysis on Pn Special functions on Pn
Harmonic analysis on Pn in polar coordinates
Fundamental domains for Pn/GL(n,Z)
Automorphic forms for GL(n,Z) and harmonic analysis
on Pn/GL(n,Z)
Chapter 5
Geometry and analysis on G/K
Geometry and analysis on G\G/K
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Fourier Analysis on Finite Groups and Applications,
Book
Description
Chapter
Contents
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Lecture Notes on various courses – beware of typos
Lectures on Advanced Calculus with Applications (Math 142 a and b)
http://math.ucsd.edu/~aterras/advanced calculus
lectures.pdf
Lectures on Applied Algebra (Math. 103 a
and b)
http://math.ucsd.edu/~aterras/applied algebra.pdf
http://math.ucsd.edu/~aterras/applied algebraII.pdf
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Talks.
My talk at Durham Symposium on Graph
Theory and Interactions
Monday 15 July - Thursday 25 July
2013
http://math.ucsd.edu/~aterras/finite & Poincare
uhp.pdf
My talk at Newton Institute, July,
2010
http://math.ucsd.edu/~aterras/2010 newton.pdf
http://math.ucsd.edu/~aterras/2010 newton.ppt
My talks at CRM Montreal, June-July, 2009
the pdfs
http://math.ucsd.edu/~aterras/montreal lecture1.pdf
http://math.ucsd.edu/~aterras/montreal lecture2.pdf
http://math.ucsd.edu/~aterras/montreal lecture3.pdf
http://math.ucsd.edu/~aterras/montreal lecture4.pdf
the powerpoint
http://math.ucsd.edu/~aterras/montreal lecture1.ppt
http://math.ucsd.edu/~aterras/montreal lecture2.ppt
http://math.ucsd.edu/~aterras/montreal lecture3.ppt
http://math.ucsd.edu/~aterras/montreal lecture4.ppt
My talk October 30, U.C.S.D. Math. Club
http://math.ucsd.edu/~aterras/What are primes in
graphs and how many.pdf
http://math.ucsd.edu/~aterras/What are primes in
graphs and how many.ppt
My talk from October 4, AMS Meeting
in Vancouver, Canada
http://math.ucsd.edu/~aterras/ihara zeta and QC.pdf
http://math.ucsd.edu/~aterras/ihara zeta and QC.ppt
My talks from MSRI Graduate Workshop, A Window Into
Zeta And Modular Physics, June 16-27, 2008.
the paper: http://math.ucsd.edu/~aterras/msripaper.pdf
the pdfs
http://math.ucsd.edu/~aterras/msri_llecture1.pdf
http://math.ucsd.edu/~aterras/msri_llecture2.pdf
http://math.ucsd.edu/~aterras/msri_llecture3.pdf
the powerpoint files
http://math.ucsd.edu/~aterras/msri_llecture1.ppt
http://math.ucsd.edu/~aterras/msri_llecture2.ppt
http://math.ucsd.edu/~aterras/msri_llecture3.ppt
My talk from the Assoc. for Women in
Math. Noether Lecture at the
AMS meeting Jan. 7, 2008 including
the parts that did not make it to the actual lecture:
http://math.ucsd.edu/~aterras/noether.pdf
http://math.ucsd.edu/~aterras/noether.ppt
My talk from Banff meeting on Quantum
Chaos: Routes to RMT Statistics and Beyond, February 24 - 29, 2008
http://math.ucsd.edu/~aterras/audrey banff talk.pdf
http://math.ucsd.edu/~aterras/Audrey Banff Talk.ppt
AMS meeting in
http://math.ucsd.edu/~aterras/specialsession.htm
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Selected
Papers
1) Survey of Spectra of Laplacians
on Finite Symmetric Spaces, Experimental Math., 5 (1996), 15-32.
Joint with H. Stark, Zeta
Functions of Finite Graphs and Coverings, Advances in Math., 121 (1996),
124-165.
2) Joint with A. Medrano, P.
Myers, H.M. Stark, Finite Euclidean graphs over rings,
Proc. Amer. Math. Soc., 126 (1988), 701-710.
3) Joint with M. Martinez, H.
Stark, Some Ramanujan Hypergraphs Associated to GL(n,Fq), Proc. A.M.S.,129 (2000),
1623-1629.
4) Joint with H. Stark, Zeta
Functions of Finite Graphs and Coverings, Part II, Advances in Math., 154
(2000), 132-195.
5) Joint with D. Wallace, Selberg's trace formula on the k-regular tree and
applications, Internatl. J. of Math. and Math. Sci., Vol. 2003, No. 8, pp. 501-526.
6) Statistics of graph spectra for
some finite matrix groups: Finite quantum chaos, in Proceedings
International Workshop on Special Functions - Asymptotics, Harmonic Analysis
and Mathematical Physics, June 21-25, 1999, Hong Kong, Edited by Charles Dunkl, Mourad Ismail, and
Roderick Wong, World Scientific, Singapore, 2000, pages 351-374.
7) Joint with H. Stark, Artin
L-Functions of Graph Coverings, in Contemporary Math., Vol. 290,
Dynamical, Spectral, and Arithmetic Zeta Functions - Edited by Michel L. Lapidus, and Machiel van Frankenhuysen, Amer. Math. Soc., 2001, pages 181-195.
8) Finite Quantum Chaos, a version
of my AWM-MAA lecture at the MathFest, August, 2000,
in
9) Joint with M. DeDeo, M.
Martinez, A. Medrano, M. Minai, H. Stark, Spectra of
Heisenberg graphs over finite rings, 2003 Supplement Volume of Discrete and
Continuous Dynamical Systems, devoted to the Proceedings of the Fourth
International Conference on Dynamical Systems and Differential Equations, May
24-27, 2002, at Wilmington, NC, Edited by W. Feng, S. Hu and X. Lu, pages
213-222.
10) Joint with M. DeDeo, M.
Martinez, A. Medrano, M. Minai, H. Stark, Zeta
functions of Heisenberg graphs over finite rings, in Theory and Applications
of Special Functions, A volume dedicated to Mizan
Rahman, edited by M. Ismail and E. Koelink,
Springer-Verlag, Developments in Math., Vol. 13,
N.Y., 2005, pp. 165-183.
11) Joint with H. Stark, Zeta
functions of graph coverings, in DIMACS: Series in Discrete Mathematics and
Theoretical Computer Science, Volume: 64, edited by M. Nathanson,
Amer. Math. Soc., 2004, pp. 199-212. http://www.ams.org/bookstore?fn=20&arg1=dimacsseries&item=DIMACS-64
Comparison of Selberg's
Trace Formula with its Discrete Analogues," in DIMACS: Series in Discrete
Mathematics and Theoretical Computer Science, Volume: 64, edited by M. Nathanson, Amer. Math. Soc., 2004, pp. 213-225.
http://www.ams.org/bookstore?fn=20&arg1=dimacsseries&item=DIMACS-64
12) Finite models for quantum
chaos, IAS/Park City Mathematics Series, Vol. 12 (2007), Automorphic Forms and
Applications; Edited by: Peter Sarnak and Freydoon Shahidi. pages 333-375.
13) Joint with H. Stark, Zeta
Functions of Finite Graphs and Coverings, Part III, Advances in Mathematics 208
(2007) 467–489.
14) Joint with M. D. Horton and D.
Newland, The Contest between the Kernels in the Selberg Trace Formula for the
(q+1)-regular Tree, in Contemporary Mathematics, Volume 398 (2006), The
Ubiquitous Heat Kernel, Edited by Jay Jorgenson and Lynne Walling, pages
265-294.
http://www.ams.org/bookstore/conmseries
15) Joint with M. D. Horton and H.
M. Stark, What are Zeta Functions of Graphs and What are They Good For?, Contemporary Mathematics, Volume 415 (2006), Quantum
Graphs and Their Applications; Edited by Gregory Berkolaiko,
Robert Carlson, Stephen A. Fulling, and Peter Kuchment,
pages 173-190.
http://www.ams.org/bookstore/conmseries
16) Joint with Anthony Shaheen, Fourier expansions of complex-valued Eisenstein
series on finite upper half planes, International Journal of Mathematics and
Mathematical Sciences, Volume 2006, Article ID 63918, Pages 1–17.
17) Joint with M. D. Horton and H.
M. Stark, Zeta Functions of Weighted Graphs and Covering Graphs, in Proc. Symp. Pure Math., Vol. 77, Analysis on Graphs, Edited by Exner, Keating, Kuchment, Sunada and Teplyaev, AMS, 2008.
18) Zeta functions and Chaos, submitted for a chapter in the
volume from the MSRI conference organized by Floyd Williams, titled Window into Zeta and Modular Physics. http://www.math.ucsd.edu/~aterras/msripaper.pdf
19) Looking into a Graph Theory
Mirror of Number Theoretic Zetas, submitted to the volume from the Banff Women
in Numbers Conference Proceedings. http://www.math.ucsd.edu/~aterras/mywinpaper.pdf
20) Finite Analogs of Maass Wave Forms,
preprint. http://www.math.ucsd.edu/~aterras/finite analogs of maass forms.pdf
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preliminary versions of some papers with color pictures
Joint with D. Wallace, Selberg's trace formula on the k-regular tree and
applications
http://math.ucsd.edu/~aterras/treetrace.pdf
Joint with M. DeDeo, M. Martinez, A.
Medrano, M. Minai, H. Stark, Spectra of Heisenberg
graphs over finite rings: Histograms, Zeta Functions, and Butterflies
http://math.ucsd.edu/~aterras/heis.pdf
Joint with H. Stark, Zeta Functions
of Finite Graphs and Coverings, Part III, Advances in Mathematics 208 (2007)
467–489
http://math.ucsd.edu/~aterras/newbrauer.pdf
Joint with M. D. Horton and D.
Newland, The Contest between the Kernels in the Selberg Trace Formula for the
(q+1)-regular Tree.
http://math.ucsd.edu/~aterras/heatblasted.pdf
Joint with M. D. Horton and H. M.
Stark, What are Zeta Functions of Graphs and What are
They Good For?
http://math.ucsd.edu/~aterras/snowbird.pdf
Joint with Anthony Shaheen, Fourier expansions of complex-valued Eisenstein
series on finite upper half planes,
http://math.ucsd.edu/~aterras/finite
fourier expansions.pdf
Joint with M. D. Horton and H. M.
Stark, Zeta Functions of Weighted Graphs and Covering Graphs, preprint;
http://www.math.ucsd.edu/~aterras/cambridge.pdf
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1) talk given in the Analysis on
Graphs and its Applications Program at Newton Institute, Cambridge,
England, March, 2007 ; (examples of primes slide
corrected to eliminate tail)
2) a stroll through the graph zeta garden (given at IAS women & math. program, may, 2006) zeta stroll.pdf
3) What are zeta functions of graphs
and what are they good for? (given at Snowbird,
4) Introduction to Artin L-Functions
of Graph Coverings, Winter, 2004 at IPAM,
UCLA: pdf version (new ucla talk.pdf);
powerpoint version (fun zeta and L fns.ppt)
5) Introductory lectures on finite
quantum chaos (newchaos.pdf)
6) Artin L-Functions of Graph
Coverings, Part I (Summer, 2002) artin1.pdf
Artin L-Functions of
Graph Coverings, Part II (Summer, 2002) artin2.pdf
7) "Artin L-functions of Graph
Coverings" given at Math. Sciences Research Institute,
SOME
ANIMATIONS
http://math.ucsd.edu/~aterras/chaos.gif
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CONFERENCES
-2) MSRI - 2011- Arithmetic Statistics, January 10, 2011 –
May 20, 2011
-1) SMS - 2009 Summer School on Automorphic Forms
and L-Functions: Computational Aspects, June 22 - July 3, 2009
0) 08w5112 WIN: Women in Numbers,
November 2 -7, 2008. http://www.birs.ca/birspages.php?task=displayevent&event_id=08w5112
1) MSRI Graduate
Workshop, A Window Into Zeta And
Modular Physics, June 16-27, 2008.
http://www.msri.org/calendar/sgw/WorkshopInfo/449/show_sgw
2) AIM, Workshop on Computing arithmetic spectra, March 10 - 14, 2008
http://www.aimath.org/ARCC/workshops/arithspectra.html
3)
http://www.math.tamu.edu/~berko/banff/
4) IPAM meeting on Expanders in
Pure and Applied Mathematics, February 11 - 15, 2008
http://www.ipam.ucla.edu/programs/eg2008/
5) AMS meeting in
Special Sessions: Zeta
Functions of Graphs, Ramanujan Graphs, and Related Topics, Sunday January 6,
2008, 8:00-10:50 a.m., 2:15- 6:05 p.m
Expanders and Ramanujan Graphs:
Constructions and Applications, Tuesday Jan. 8,
1:00 p.m.-5:50 p.m., Wednesday January 9, 2008, 8:00 a.m.-10:50 a.m., 1:00
p.m.-5:50 p.m.
6) Southern
http://math.uci.edu/~krubin/scntd/
7) Isaac Newton Institute for
Mathematical Sciences, Analysis on Graphs and its Applications, 8 January - 29
June 2007; http://www.newton.cam.ac.uk/programmes/AGA/
8) IAS Program for Women in
Math., May 16-27, 2996 http://www.math.ias.edu/womensprogram or
http://www.math.ucsd.edu/~aterras/ias women.pdf
9) Conference on Lie Groups,
Representations and Discrete Mathematics, IAS Princeton, February 6 - 10, 2006
10) Seminar
Aachen-Köln-Lille-Siegen on Automorphic Forms, June 29, 2005
http://www.matha.rwth-aachen.de/seminar-akls/Automorphic_Forms__Aachen-2005-06-29.pdf
11) The AMS – IMS – SIAM
Joint Summer Research Conference on Quantum Graphs and Their Applications;
Sunday, June 19 to Thursday, June 23; http://www.math.tamu.edu/~kuchment/src05_graphs.htm
12) Number Theory Conference in
Honor of Harold Stark, Aug. 5-7, 2004; (http://math.ucsd.edu/~aterras/Birthday.ppt)
13) Workshop on Automorphic Forms,
Group Theory and Graph Expansion, Feb. 9-13, 2004, Institute for Pure and
Applied Math. at UCLA. Website (http://www.ipam.ucla.edu/programs/agg2004/
)
14) Computational Number Theory
Workshop at the Foundations of Computational Mathematics 2002 Meeting at the
University of
15) I was one of the many
lecturers in the
16) The 19th Algebraic
Combinatorics Symposium, July 1-3, 2002,
17) I organized a Special
Session on Zeta Functions of Graphs and Related Topics at the Fourth
International Conference on Dynamical Systems and Differential Equations to be
held May 24-27, 2002 in Wilmington, North Carolina. The aim of the session was
to discuss current work on the Ihara-Selberg functions attached to graphs and
related topics such as Ramanujan graphs, the trace formula on trees. The hope
was to emphasize connections between various fields such as graph theory,
topology, mathematical physics, number theory, dynamical systems. One example
is the connection between graph zeta functions and Jones polynomials of knots
found by Lin and Wang. The conference website is http://www.uncwil.edu/mathconf/.
Special session abstracts can be found at abstracts.htm.
Proceedings appeared in 2003 Supplement Volume of Discrete and
Continuous Dynamical Systems, devoted to the Proceedings of the Fourth
International Conference on Dynamical Systems and Differential Equations, May
24-27, 2002, at Wilmington, NC, Edited by W. Feng, S. Hu and X. Lu
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Some of my Pictures can be found at
and
The last one is a tessellation of the
finite upper half plane for the field with 11*11 elements coming from the group
of non-singular 2x2 matrices from the field with 11 elements. Explanations can be found in
http://www.math.ucsd.edu/%7Eaterras/newchaos.pdf
.
An alternative picture of that
tessellation follows.
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Short Biography
AUDREY TERRAS received her B.S. degree in Mathematics from
the University of Maryland, College Park in 1964, where she was inspired by the
lectures of Sigekatu Kuroda to become a number
theorist. She was particularly impressed by the use of analysis (in particular
using zeta functions and multiple integrals) to derive algebraic results. She
received her M.A. (1966) and Ph.D. (1970) from Yale University. In 1972 she became an assistant professor of
mathematics at the University of California, San Diego. She became a full
professor at U.C.S.D. in 1983. She retired in 2010. She has had 25 Ph.D.
students. She is a fellow of the Association for Women in Mathematics, the
American Mathematical Society, and the American Association for the Advancement
of Science, has served on the Council of the American Mathematical Society,
gave the 2008 Noether lecture of the Association for
Women in Mathematics. She has published 5 books, helped to edit another, and
published lots of research papers. Her research interests include number
theory, harmonic analysis on symmetric spaces and finite groups (including
applications), special functions, algebraic graph theory, especially zeta
functions of graphs, arithmetical quantum chaos, and Selberg’s
trace formula. When
lecturing on mathematics, she believes it is important to give examples,
applications and colorful pictures.
Ph.D. STUDENTS WITH COMPLETED DEGREES (U.C.S.D.)
25 students
2010 Thomas Petrillo
2006 Matthew Horton
2005 Derek Newland, Anthony Shaheen
2001 F. Javier Marquez
2000 Marvin Minei
1998
Maria Martinez, Michelle DeDeo, Archie Medrano
1995
Perla Myers
1993 Jeff Angel, Cindy Trimble
1991 Nancy Celniker,
Steven Poulos, Elinor Velasquez
1989 Maria Zack
1988 Jason Rush
1986 Daniel Gordon, Douglas Grenier, Dennis Healy
1985 Michael Berg
1982 Dorothy Wallace Andreoli,
John Hunter
1981 Thomas Bengtson
1979 Kaori Imai Ohta
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