Sofia University, Bulgaria
Doc. of Sci. in Mathematics (Second Doctoral Degree) 1983
Ph.D. 1977 in Mathematics; Thesis Advisor: Vasil A. Popov
Sofia University, Bulgaria
B.S. June 1972 in Mathematics
Professional Employment (Permanent Positions):
|2009 – present||Director||Interdisciplinary Math. Institute, USC, Columbia|
|1996 – present||Professor||Department of Mathematics, USC, Columbia|
|1986 – 1996||Professor||Inst. of Mathematics, Bulg. Acad. of Sciences|
|1982 – 1986||Senior Research Fellow||Inst. of Mathematics, Bulg. Acad. of Sciences|
|1977 – 1982||Research Fellow||Inst. of Mathematics, Bulg. Acad. of Sciences|
Awards and Honors:
The 2010 USC Educational Foundation Award for Research in Science, Mathematics, and Engineering
The 1989 Bulgarian Mathematical Scienece Award "N. Obreshkov" awarded by the Bulgarian Academy of Sciences and Sofia University
Constructive Approximation - 2004 – present
SIAM Journal on Mathematical Analysis - 2010 – present
Journal of Fourier Analysis and Applications - 2012 – present
Foundations of Computational Mathematics - 2014 – present
Analysis in Theory and Applications - 1990 – present
Serdica Mathematical Journal - 2004 – present
Mathematics - Open Access Journal - 2012 - Present
Doctoral Students: at USC
Borislav Karaivanov, Thesis Title: "Nonlinear piecewise polynomial approximation: Theory and Algorithms", completed in December 2001.
Kyungwon Park, Thesis Title: "Bivariate Rational Approximation and Anisotropic Franklin Bases", completed in May 2004.
Master Students: at USC.
Xiang Yu, Department of Computer Science, USC, Thesis Title: "Clientserver system for progressive image transmission based on Adaptive wavelet bases", completed in May 2001.
Wendy Newcomb, Department of Mathematics, USC, Thesis Title: "Fast Evaluation of Band Limited Functions at Scattered Points on the Sphere", completed in April 2015.
Jared Szi, Department of Mathematics, USC, Thesis Title: "Chebyshev Inversion of the Radon Transform", completed in April 2016
Grant Support (last 10 years):
Title: Highly Effective Compression and Evaluation of Geodetic Quantities
PI: P. Petrushev
August 15, 2012 - August 14, 2014, extended till August 14, 2017; $750,000
Title: AEO-Light 2.0:An Open Source Application for Image-Based Digital
Reproduction of Optical Film Sound
PI: G. Wilsbacher, Co-PI: P. Petrushev
January 1, 2015 - December 31, 2016; $222,146
Title: Representation and Approximation of Functions in Nonclassical and Anisotropic Settings with Applications
PI: P. Petrushev
June 1, 2012 - May 31, 2015; $170,011
Title: An Open Source Application for Image-Based Digital Reproduction of Optical Film Sound
PI: G. Wilsbacher, Co-PIs: P. Petrushev, M. Cooper, B. Karaivanov
May 2011 - May 2014; $362,500
Title: Efficacy of Laryngeal High-Speed Videoendoscopy
PI: D. Deliyski, Co-PI: P. Petrushev
February 1, 2007 - February 1, 2014 (extended); $3,078,774
Title: Throat Clearing, Coughing, and Alternative Behaviors
PI: Bonilha Heather (Medical University of South Carolina)
Subcontract PI: D. Deliyski, Co-PI: P. Petrushev
October 1, 2010 - June 30, 2011, $14,097
NSF: DMS 0709046
Title: Highly efficient methods for surface and solid sphere studies
PI: Pencho Petrushev
July 15, 2007 - September 30, 2010; $143,907
Title: Highly Effective Geospatial Representation and Analysis
PI: Pencho Petrushev
October 10, 2007 - April 10, 2009; $271,385
Cyprus University Research Grant
Title: Decomposition of Weighted Smoothness Spaces and Applications
PIs: George Kyriazis, Pencho Petrushev
September 2007 - August 2009; 17,400 CYP (about $40,000)
Title: Highly Effective Geospatial Representation and Analysis
PIs: R. DeVore and P. Petrushev (USC), D. Donoho (Stanford University)
April 26, 2005 - December 25, 2006; $461,374
Institute of Laryngology and Voice Restoration (ILVR) (Research grant)
Title: Enhanced Visualization of Laryngeal High-Speed Videoendoscopy
PI: Dimitar Deliyski, Co-PI: Pencho Petrushev
May 15, 2006 - May 14, 2007; $57,509
Conference Organizing or Program Committees:
Nine international Approximation Theory Conferences in Bulgaria;
Invited Conference Talks (last 10 years):
- International conference "Pioneers of Bulgarian mathematics" Sofia, Bulgaria, July 8-10, 2006
- Conference in Oberwolfach "Wavelet and Multiscaler Methods", July 29 - August 4, 2007
- Conference on Time-Frequency, STROBL09, Strobl, Austria, June 15 - 20, 2009
- International workshop "Nonlinear and Adaptive Approximation" at Castle Reisensburg (Günzburg), Germany, September 30 - October 3, 2009
- Workshop "Topics in Several Complex Variables and Geometry" University of Cyprus, Nicosia, November 22, 2009
- Oberwolfach Workshop: Wavelet and Multiscale Methods, August 1-7, 2010
- Conference: "From Abstract to Computational Harmonic Analysis" Strobl, Austria, June 13 - 19, 2011
- Conference: "New Trends in Approximation Theory" Ein Gedi, Israel, January 4 - 7, 2012
- Workshop: "New perspectives in Approximation theory and Applications" Laboratoire Jacques-Louis Lions, Universit Pierre et Marie Curie, Paris, June 15, 2012
- Workshop: "Applied Coorbit Theory" Erwin Schroedinger Institute (Univ. Vienna), Austria, September 17 - 21, 2012
- Numerical Methods for PDEs: On Occasion of Raytcho Lazarov's 70th Birthday Texas A&M University, Collage Station, January 25-26, 2013
- Oberwolfach Workshop "Multiscale and High-Dimensional Problems", July 28th - August 3rd, 2013
- Int. Conference CONSTRUCTIVE THEORY OF FUNCTIONS - 2013, Sozopol, Bulgaria, June 9 - 15, 2013
- 8th Internat. Conference "Curves and Surfaces", Paris, June 12-18, 2014; Invited plenary talk (opening talk of conference)
- International Conference Mathematics Days in Sofia, Sofia, Bulgaria, July 7-10, 2014; Invited plenary talk
- Foundations of Computational Mathematics conference, FoCM 2014 - Montevideo, Uruguay, December 11 - 20, 2014; Invited plenary talk
- International Conference on Multivariate Approximation, Giessen, Schloss Rauischholzhausen, March 31 - April 5, 2016
- International Conference Constructive Theory of Functions - 2016, Sozopol, Bulgaria, June 11 - 17, 2016; Invited plenary talk
Colloquia and Invited Seminar Talks (last 10 years):
- Department of Mathematics and Statistics, University of Cyprus, Nicosia, November 22, 2006
- Institute of Math. and Informatics, Bulgarian Academy of Sciences, Sofia, December 21, 2006
- Department of Mathematics and Statistics, University of Cyprus, Analysis Seminar, Thursday, June 5, 2008
- Institute of Mathematics and Informatics, Bulgarian Academy of Sciences Mathematical Modelling Seminar, Wednesday, November 26, 2008
- Department of Mathematical Sciences, Aalborg University, Denmark, March 12, 2009
- Colloquium talk given at the Department of Mathematics, USC, November 18, 2010
- Analysis Seminar, Tel Aviv University, June 18, 2013
- Beijing Normal University, Function spaces seminar, April 14, 2014
- Beijing Normal University, General seminar, April 18, 2014
- University of Linkoping, Sweden, Analysis seminar, September 24, 2014
Service on Professional Panels:
Member of the Vasil A. Popov Prize Selection Committee, since 1994
American Mathematical Society, SIAM, Bulgarian Mathematical Society
Approximation Theory, Harmonic Analysis, Numerical Analysis
- Spaces of distributions such as Hardy, Besov and Triebel-Lizorkin spaces in harmonic, nonclassical, anisotropic and geometric settings
- Construction of bases and frames (needlets) for Besov and Triebel- Lizorkin spaces in nonclassical and geometric settings
- Nonlinear approximation from rational functions, splines, frames, ridge functions and more general dictionaries
- Application of spherical needlets to approximation and fast evaluation of quantities represented in high degree surface or solid spherical harmonics
- Reproduction of sound from optical sound tracks of digital scans of motion picture films
100 (1 book, 94 articles in print, 1 in press , and 4 submitted for publication)
- P. Petrushev, V. Popov, "Rational approximation of Real Functions", Cambridge University Press, 1987, 371 pages.
- P. Petrushev, Relations between rational and spline approximations in Lp metric, J. Approx. Theory, 50 (1987), 141–159.
- P. Petrushev, Direct and converse theorems for rational and spline approximation and Besov spaces, Lecture Notes in Mathematics 1302, Proceedings of the Conference "Function Spaces and Applications", Lund 1986, 1988, pp. 363–377.
- E. Moskona, P. Petrushev, Uniform rational approximation of functions with first derivative in the real Hardy space ReH1, Constr. Approx. 7 (1991), 69–103.
- R. DeVore, P. Petrushev, and X. Yu, Nonlinear wavelet approximation in the space C(Rd), Progress in Approximation Theory (A. A. Gonchar, E. B. Saff, eds.), New York, Springer-Verlag, 1992, pp. 261–283.
- P. Binev, E. Saff, P. Petrushev, and O. Trifonov, Distribution of interpolation points of best L2–approximants (nth partial sums of Fourier series), Constr. Approx. 9 (1993), 445–472.
- R. DeVore, P. Petrushev, and V. Temlyakov, Multivariate trigonometric polynomial approximation with frequencies from the hyperbolic cross, Mat. Zametki, 56 (1994), 36–63 (English translation in Math. Notes, 56 (1994), 900–918).
- E. Moskona, P. Petrushev, and E. Saff, Gibbs phenomenon for best L1–trigonometric polynomial approximation, Constr. Approx. 11 (1995), 391–416.
- R. DeVore, K. Oskolkov, and P. Petrushev, Approximation by feedforward neural networks, Ann. Numer. Math. 4 (1997), 261–287.
- P. Petrushev, Approximation by ridge functions and neural networks, SIAM J. Math. Anal. 30 (1998), 155–189.
- A. Cohen, R. DeVore, P. Petrushev, and H. Xu, Nonlinear, Approximation and the space BV (R2), Amer. J. Math. 121 (1999), 587–628.
- P. Petrushev, Bases consisting of rational functions of uniformly bounded degrees or more general functions, J. Funct. Anal. 174 (2000), 18–75.
- G. Kyriazis, P. Petrushev, New bases for Triebel-Lizorkin and Besov spaces, Trans. Amer. Math. Soc. 354 (2002), no. 2, 749–776.
- P. Binev, W. Dahmen, R. DeVore, P Petrushev, Approximation classes for adaptive methods, Serdica Math. J. 28 (2002), 1001–1026.
- P. Petrushev, Multivariate n-term rational and piecewise polynomial approximation, J. Approx. Theory, 121 (2003), 158–197.
- B. Karaivanov, P. Petrushev, Nonlinear piecewise polynomial approximation beyond Besov spaces, Appl. Comput. Harmon. Anal. 15 (2003), 177–223.
- B. Karaivanov, P. Petrushev, and R. Sharpley, Nonlinear piecewise polynomial approximation: Algorithms, Trans. Amer. Math. Soc. 355 (2003), 2585–2631.
- O. Davydov, P. Petrushev, Nonlinear approximation from differentiable piecewise polynomials, SIAM J. Math. Anal. 35 (2003), 708–758.
- P. Petrushev, Nonlinear n-term approximation from hierarchical spline bases, Constructive Theory of Functions , Varna 2002 (B. Bojanov, Ed.), DARBA, Sofia, 2003, pp. 33–85.
- G. Kyriazis, K. Park, and P. Petrushev, B-spaces and their characterization via anisotropic Franklin bases, Approximation Theory: a vol- ume dedicated to Borislav Bojanov (D. K. Dimitrov, G. Nikolov, and R. Uluchev, Eds.), pp. 145–162, Prof. M. Drinov Acad. Publ. House, Sofia, 2004.
- M. Campos-Pinto, A. Cohen, and P. Petrushev, High order geometric smoothness for conservation laws, J. of Hyperbolic Differ. Equ. 2 (2005), 39–59.
- P. Petrushev, Anisotropic spaces and nonlinear n-term approximation, Approximation Theory XI: Gatlinburg 2004, 363–394, Mod. Methods Math., Nashboro Press, Brentwood, TN, 2005.
- P. Petrushev, Y. Xu, Localized polynomial frames on the interval with Jacobi weights, J. Fourier Anal. and Appl. 11 (2005), 557–575.
- W. Dahmen, P. Petrushev, "Push-the-Error" algorithm for nonlinear n-term approximation, Constr. Approx. 23 (2006), 261–304.
- G. Kyriazis, P. Petrushev, On the construction of frames on Triebel- Lizorkin and Besov spaces, Proc. Amer. Math. Soc. 134 (2006), 1759–1770.
- F. J. Narcowich, P. Petrushev, and J. D. Ward, Localized Tight Frames on Spheres, SIAM J. Math. Anal. 38 (2006), 574–594.
- F. Narcowich, P. Petrushev, and J. Ward, Decomposition of Besov and Triebel-Lizorkin spaces on the sphere, J. Funct. Anal. 238 (2006), 530–564.
- G. Kyriazis, K. Park, and P. Petrushev, Anisotropic Franklin bases on polygonal domains, Math. Nachr. 279 (2006), 1099–1127.
- G. Kerkyacharian, P. Petrushev, D. Picard and T. Willer, Needlet algorithm for estimations in inverse problems, Electronic Journal of Statistics, 1 (2007), 30–76.
- W. Dahmen, S. Dekel, and P. Petrushev, Multilevel preconditioning for partition of unity methods - some analytic concepts, Numer. Math. 107 (2007), 503–532.
- P. Petrushev, Yuan Xu, Localized polynomial frames on the ball, Constr. Approx. 27 (2008), 121–148.
- G. Kyriazis, P. Petrushev, and Yuan Xu, Jacobi decomposition of weighted Triebel-Lizorkin and Besov spaces, Studia Math. 186 (2008), 161–202.
- G. Kyriazis, P. Petrushev, and Yuan Xu, Decomposition of weighted Triebel-Lizorkin and Besov spaces on the ball, Proc. London Math. Soc. 97 (2008), 477–513.
- P. Petrushev, Yuan Xu, Decomposition of spaces of distributions induced by Hermite expansions, J. Fourier Anal. and Appl. 14 (2008), 372–414.
- G. Kerkyacharian, P. Petrushev, D. Picard, and Yuan Xu, Decomposition of Triebel-Lizorkin and Besov spaces in the context of Laguerre expansions, J. Funct. Anal. 256 (2009), 1137–1188.
- G. Kyriazis, P. Petrushev, On the construction of bases and frames for spaces of distributions, J. Funct. Anal. 257 (2009), 2159–2187.
- S. Dekel, Y. Han, and P. Petrushev, Anisotropic meshless frames on Rn, J. Fourier Anal. and Appl. 15 (2009), 634–662.
- S. Dekel, P. Petrushev, Anisotropic function spaces with applications, in "Multiscale, Nonlinear and Adaptive Approximation", Dedicated to Wolfgang Dahmen on the Occasion of his 60th Birthday, R. DeVore, A. Kunoth (Eds.) Springer, 2009, ISBN 978-3-642-03412-1.
- W. Dahmen, S. Dekel, and P. Petrushev, Two-level-split Decomposition of Anisotropic Besov Spaces, Constr. Approx. 31 (2010), no. 2, 149–194
- K. Ivanov, P. Petrushev, and Yuan Xu, Sub-exponentially localized kernels and frames induced by orthogonal expansions, Math. Z. 264 (2010), 361–397.
- G. Kerkyacharian, G. Kyriazis, E. Le Pennec, P. Petrushev and D. Picard, Inversion of noisy Radon transform by SVD based needlets, Appl. Comput. Harmon. Anal. 28 (2010), 24–45.
- S. Dekel, P. Petrushev and T. Weissblat, Hardy spaces on Rn with pointwise variable anisotropy, J. Fourier Anal. and Appl. 17 (2011), 1066–1107.
- T. Coulhon, G. Kerkyacharian, P. Petrushev, Heat Kernel Generated Frames in the Setting of Dirichlet Spaces, J. Fourier Anal. Appl. 18 (2012), no. 5, 995–1066.
- K. Ivanov, P. Petrushev, Yuan Xu, Decomposition of spaces of distributions induced by tensor product bases, J. Funct. Anal. 263 (2012), no. 5, 1147–1197.
- G. Kyriazis, P. Petrushev, "Compactly" supported frames for spaces of distributions on the ball, Monatsh. Math. 165 (2012), no. 3-4, 365–391.
- K. Ivanov, P. Petrushev, Highly effective evaluation and reconstruction of geodetic quantities on the sphere, Proceedings of the ASPRS 2013 Annual Conference, Baltimore, March, 2013.
- G. Kyriazis, P. Petrushev, Rational bases for spaces of holomorphic functions in the disc, J. Lond. Math. Soc. (2) 89 (2014), no. 2, 434–460.
- K. Ivanov, P. Petrushev, Irregular sampling of band-limited functions on the sphere, Appl. Comput. Harmon. Anal. 37 (2014), no. 3, 545–562.
- S. Dekel, G. Kerkyacharian, G. Kyriazis, P. Petrushev, Compactly supported frames for spaces of distributions associated with nonnegative self-adjoint operators, Studia Math. 225 (2014), no. 2, 115–163.
- K. Ivanov, P. Petrushev, Fast Evaluation and Irregular Sampling of Band-limited Functions on the Sphere, Proceedings of the International Conference "Constructive theory of functions - 2013" Sozopol, Prof. Marin Drinov, Academic Publishing House, Sofia 2014, pp. 115–140. ISBN 978-954-322-811-9
- G. Kerkyacharian, P. Petrushev, Heat kernel based decomposition of spaces of distributions in the framework of Dirichlet spaces, Trans. Amer. Math. Soc. 367 (2015), 121–189.
- K. Ivanov, P. Petrushev, Fast memory efficient evaluation of spherical polynomials at scattered points, Adv. Comput. Math. 41 (2015), no. 1, 191–230.
- K. Ivanov, P. Petrushev, Highly effective stable evaluation of bandlimited functions on the sphere, Numer. Algorithms, 71 (2016), no. 3, 585–611.
- K. Ivanov, P. Petrushev, Harmonic Besov and Triebel-Lizorkin spaces on the ball, J. Fourier Anal. Appl. (to appear) DOI 10.1007/s00041-016-9499-1
- M. Lind, P. Petrushev, Nonlinear nonnested 2-d spline approximation, Constr. Approx. (to appear)
- S. Dekel, G. Kerkyacharian, G. Kyriazis, and P. Petrushev, Hardy spaces associated with non-negative self-adjoint operators, preprint.
- S. Dekel, G. Kerkyacharian, G. Kyriazis, and P. Petrushev, A new proof of the atomic decomposition of Hardy spaces, preprint.
- G. Kerkyacharian, S. Ogawa, P. Petrushev, and D. Picard, Regularity of Gaussian Processes on Dirichlet spaces, preprint.