Josef   Sifuentes

Assistant Professor  

Office: EMAGC 3.614
Phone: (956) 665-2197
Email: josef.sifuentes@utrgv.edu

Professor Josef Sifuentes

Dr. Josef Sifuentes is an applied mathematician who specializes in numerical linear algebra, with an emphasis in Krylov subspace methods and fast integral algorithms.





Selected Publications


  • Josef Sifuentes and Shari Moskow. "Preconditioning Methods for Thin Scattering Structures Based on Asymptotic Results," SIAM Journal on Scientific Computing 40, no. 4 (July (3rd Quarter/Summer) 2018): B1007–B1019.

  • Josef Sifuentes, Zydrunas Gimbutas, and Leslie Greengard. "Randomized methods for rank-deficient linear systems," Electronic Transactions on Numerical Analysis 44, (February 2015): 177-188.

  • Josef Sifuentes, Mark Embree, and Ronald Morgan. "The stability of GMRES convergence, with application to preconditioning by approximate deflation.," SIAM Journal of Matrix Analysis and Applications 34, no. 3 (July (3rd Quarter/Summer) 2013): 1066-1088.

  • Josef Sifuentes, Mark Embree, Soodholter Kirk, Daniel Szyld, and Fei Xue. "Short-term recurrence Krylov subspace methods for nearly-Hermitian matrices.," SIAM Journal of Matrix Analysis and Applications 33, no. 2 (June 2012): 480-500.

  • Josef Sifuentes. Preconditioned Iterative Methods for Inhomogeneous Acoustic Scattering Applications. May 2010.

  • Josef Sifuentes. "Heavy Metal - Combining Art and Mathematics," Mathematical Science and Research Institute Emissary, October (4th Quarter/Autumn) 2003.

  • Josef Sifuentes, Zydrunas Gimbutas, and Leslie Greengard. "Optimized quadratures for the Sommerfeld representation of acoustic and electromagnetic fields.," .

  • Josef Sifuentes, Gilbert Ymbert, and Mark Embree. "Approximate Murphy-Golub-Wathen preconditioning for saddle point problems.," .

  • Josef Sifuentes, Mrinal Kanti Roychowdhury, and Santanu Chakraborty. "High precision numerical computation of principal points for univariate distributions," Communications in Mathematical Sciences .



Selected Grants and Fellowships


  • Timothy Huber. Collaborative Research: A Texan Partnership towards a Diverse PhD Pool in Mathematics, NSF DMS-Infrastructure Program PAPPG NSF 17-1, $443,932.00 (August 1, 2018 - August 31, 2020)



Selected Presentations


  • Santanu Chakraborty, Mrinal Kanti Roychowdhury, and Josef Sifuentes. "High Precision Numerical Computation of Principal Points for Univariate Distributions," AMS Sectional Meeting , American Mathematical Society, Nashville, Tennessee (April 2018)

  • Josef Sifuentes. "High precision numerical computation of principal points for univariate distributions," Statistics and Probability Seminar, UTRGV SMSS, UTRGV (March 2018)

  • Josef Sifuentes. "High precision numerical computation of principal points for univariate distributions," AMS - Fall Southeastern Sectional Meeting, American Mathematical Society, University of Central Florida - Orlando, Florida (September 2017)

  • Josef Sifuentes, Gilbert Ymbert, and Mark Embree. "Approximate Murphy-Golub-Wathen Preconditioning For Saddle Point Problems.," Householder Symposium on Numerical Linear Algebra, Blacksburg, VA (June 2017)

  • Josef Sifuentes. " Approximate Murphy-Golub-Wathen Preconditioning For Saddle Point Problems," Visiting Scholars Workshop, SMSS, Edinburg, Texas (November 2016)

  • Jean Linhart, Adam Larios, and Josef Sifuentes. "Programming and Problem Solving: Getting Started on the Right Foot," MAA Mathfest, MAA, Columbus Ohio (August 2016)

  • Josef Sifuentes, Zydrunas Gimbutas, and Leslie Greengard. "Randomized Methods for Rank-Deficient Linear Systems," SIAM Annual Meeting, SIAM, Boston, MA (July 2016)

  • Josef Sifuentes. "Krylov Subspaces: Results and Open Problems ," Pure Math Seminar in UTRGV SMSS, SMSS, Edinburg, Texas (April 2016)

  • Josef Sifuentes. "Approximate deflation preconditioning for iterative methods," Visiting Scholars Workshop, SMSS, Edinburg, Texas (November 2015)

  • Josef Sifuentes. "Approximate Murphy-Golub-Wathen Preconditioning For Saddle Point Problems," Applied Math Seminar of the SMSS, SMSS, Edinburg, Texas (October 2015)

Current Courses

MECE 3449 02 - Mech Engineering Analysis I:
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MATH 4373 02I - Real Analysis II:
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MATH 3343 01 - Intro to Math Software:
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MECE 3449 02 - Mech Engineering Analysis I:
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MATH 4390 05 - Math Project:
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MATH 7301 08 - Thesis II:
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MATH 4373 01I - Real Analysis II:
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MATH 3372 01 - Real Analysis I:
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Previous Courses