presentations at conferences
 Error norm estimation in CGlike methods for solving linear leastsquares problems,
High Performance Computing in Science and Engineering 2024, Soláň,
Czech Republic (May 2023, 2024).
[slides]
[HPCSE 2024]
 On the behaviour of the GaussRadau upper bound,
GAMM Workshop on Applied and Numerical Linear Algebra 2022, Prague,
Czech Republic (September 2223, 2022).
[slides]
[GAMM ANLA 2022]
 How to control the accuracy of error estimates in CG?,
Householder Symposium XXI, Hotel Sierra Silvana, Selva di Fasano,
Italy (June 1217, 2022).
[slides]
[Householder Symposium XXI]
 The multiplicative Schwarz method for matrices with a special block structure,
ALGORITMY 2020  Conference on Scientific Computing,
Podbanske, Slovakia (September 1015, 2020).
[slides]
[ALGORITMY 2020]
 Characterization of halfradial matrices,
MAT TRIAD 2019, Liblice, Czech Republic (September 813, 2019).
[slides]
[MAT TRIAD 2019]
 Approximating the extremal Ritz values in CG,
The International Conference Mathematical Modeling with Applications (M2A19), Rabat Morocco (April 14, 2019).
[slides]
[M2A19]
 The Field of Values Bounds on Ideal GMRES,
89th GAMM Annual Meeting, Munich, Germany (March 1923, 2018).
[slides]
[GAMM 2018]
 Towards Practical Estimation of the Anorm of the error in CG,
Householder Symposium XX, Blacksburg, Virginia, USA (June 1823, 2017).
[slides]
[Householder Symposium XX]
 On Error Estimation in the Conjugate Gradient Method ,
Algoritmy 2016,
Slovakia (March 1318, 2016).
[slides]
[Algoritmy 2016]
 On the numerical behavior of quadraturebased bounds for the Anorm of the error in CG,
SIAM Conference on Applied Linear Algebra, Atlanta, USA, (October 2630, 2015).
[poster]
[SIAMALA 2015]
 A new algorithm for computing quadraturebased bounds in conjugate gradients ,
Householder Symposium XIX,
Spa, Belgium (June 813, 2014).
[slides]
[Householder Symposium XIX]
 On matrix approximation problems that bound GMRES convergence,
Mat Triad 2013, HercegNovi, Montenegro (September 1520, 2013).
[slides]
[Mat Triad 2013]
 On computing quadraturebased bounds for the Anorm of the error in conjugate gradients,
ALGORITMY 2012  Conference on Scientific Computing,
Podbanske, Slovakia (September 914, 2012).
[slides]
[ALGORITMY 2012]
 On worstcase GMRES,
ALA 2012  SIAM Conference on Applied Linear Algebra,
Valencia, Spain (June 1822, 2012).
[slides]
[ALA 2012]
 The FaberManteuffel theorem and its consequences,
ICIAM 2011,
Vancouver, Canada (June 2125, 2011).
[slides]
[ICIAM 2011]
 On best approximation by polynomials of matrices ,
Householder Symposium XVIII, Granlibakken, USA (June 1217, 2011). Invited plenary talk.
[slides]
[Householder Symposium XVIII]
 On efficient numerical approximation of the bilinear form c^{*}A^{1}b,,
16th Conference of the International Linear Algebra Society ILAS 2010, Pisa, Italy (June 2125, 2010).
[slides]
[ILAS 2010]
 On Chebyshev Polynomials of Matrices,
Applied Linear Algebra, In Honor of Hans Schneider,
Novi Sad, Serbia (May 2428, 2010).
[slides]
[ALA 2010]
 On efficient numerical approximation of the scattering amplitude,,
SIAM Conference on Applied Linear Algebra, Monterey, USA (October 2629, 2009).
[slides]
[SIAM ALA 2009]
 On efficient numerical approximation of the scattering amplitude,
Modelling 2009,
Roznov pod Radhostem, Czech Republic (June 2226, 2009).
[slides]
[Modelling 2009]
 On short recurrences for generating orthogonal Krylov subspace bases,
ALGORITMY 2009  Conference on Scientific Computing,
Vysoke Tatry  Podbanske, Slovakia (March 1520, 2009).
[slides]
[ALGORITMY 2009]
 On best approximations of matrix polynomials ,
GAMM Workshop on Applied and Numerical Linear Algebra,
Hamburg, Germany (September 1112, 2008).
[slides]
 On a New Proof of the FaberManteuffel Theorem,
Householder Symposium XVII,
Zeuthen, Germany (June 16, 2008).
[slides]
[Householder Symposium XVII]

On a New Proof of the FaberManteuffel Theorem,
Applied Linear Algebra, In Honor of Ivo Marek,
Novi Sad, Serbia (April 2830, 2008).
[slides]
 On Ideal and Worstcase GMRES,
22nd Biennial Conference on Numerical Analysis,
University of Dundee, Scotland, United Kingdom of Great Britain and Northern Ireland (June 2629, 2007).
[slides]
[NAconf 2007]
 Ideal GMRES and polynomial numerical hull for a Jordan block,
GAMMSIAM conference on Applied Linear Algebra,
Düsseldorf, Germany (July 2427, 2006).
[slides]
[GAMMSIAM ALA 2006]
 Ideal GMRES and polynomial numerical hull for a Jordan block,
GAMM Jahrestagung 2006,
Berlin, Germany (March 2731, 2006).
[GAMM 2006]
 Worstcase and Ideal GMRES for a Jordan Block,
Householder Meeting on Numerical Linear Algebra XVI,
Seven Springs Mountain Resort, Champion, Pennsylvania, USA (May 2327, 2005).
[slides]
[Householder XVI 2005]
 Efficient Estimation of the Anorm of the Error in PCG,
Preconditioning 2005,
International Conference On Preconditioning Techniques For Large Sparse
Matrix Problems In Scientific And Industrial Applications,
Emory University, Atlanta, Georgia, USA (May 1921, 2005).
[slides]
 On the nexttolast CG and MR iteration step,
GAMM Jahrestagung 2005,
Luxembourg, Germany (March 28  April 1, 2005).
[slides]

On the nexttolast CG and MR iteration step,
ALGORITMY 2005  Conference on Scientific Computing,
Vysoke Tatry  Podbanske, Slovakia (March 1318, 2005).
[ALGORITMY 2005]
 The worstcase GMRES for normal matrices,
Iterative methods, preconditioning and numerical PDEs (IMET 2004),
Prague, Czech Republic (May 2528, 2004).
[slides]
[IMET 2004]

The worstcase GMRES for normal matrices,
GAMM Jahrestagung 2004,
Dresden, Germany (March 2126, 2004).
[GAMM 2004]
 On estimating the Anorm of the error in CG and PCG,
Workshop Numerical linear algebra and its applications,
Monopoli, Bari, Italy (September 2224, 2003).
[slides]
 On the error estimation in CG and PCG,
GAMM Jahrestagung 2003,
Abano Terme, Italy (March 2428, 2003).
presentations at seminars and schools
 Behaviour of the GaussRadau upper bound,
Seminar on Numerical Analysis (SNA) 2023,
Ostrava, Czech Republic (January 23  27, 2023).
[slides]
 On the Forsythe conjecture,
Seminar of Numerical Mathematics, MFF UK,
Czech Republic (December 15, 2022).
[slides]
[Seminar of Numerical Mathematics]
 On error estimation in CG,
Programy a algoritmy numerické matematiky 21, PANM 21,
Hotel Merkur, Jablonec nad Nisou, Czech Republic (June 1924, 2022).
[slides]
[PANM 2022]
 The multiplicative Schwarz method for matrices with a special block structure,
Programy a algoritmy numerické matematiky 20, PANM 20,
Hejnice, Czech Republic (June 2429, 2020).
[slides]
[PANM 2020]
 Krylov subspace methods: Connections and open questions,
Seminar of Numerical Mathematics, MFF UK,
Czech Republic (March 19, 2019).
[slides]
[Seminar of Numerical Mathematics]
 On improving accuracy of the error estimates in the conjugate gradient method,
Programy a algoritmy numerické matematiky 19, PANM 19,
Hejnice, Czech Republic (June 2429, 2018).
[slides]
[PANM 2018]
 The conjugate gradient method from different perspectives,
Seminar ustavu matematiky VSCHT,
Czech Republic (December 7, 2016).
[slides]
[Seminar ustavu matematiky VSCHT]
 On solving linear systems arising from Shishkin mesh discretizations,
Seminar of Numerical Mathematics, MFF UK,
Czech Republic (October 20, 2016).
[slides]
[Seminar of Numerical Mathematics]
 On solving linear systems arising from Shishkin mesh discretizations,
Programy a algoritmy numerické matematiky 18, PANM 18,
Dolni Maxov, Czech Republic (June 1924, 2016).
[PANM 2016]
 On computing quadraturebased bounds for the Anorm of the error in conjugate gradients,
Programy a algoritmy numerické matematiky 16, PANM 16,
Dolni Maxov, Czech Republic (June 0308, 2012).
[slides]
 On Chebyshev Polynomials of Matrices,
Programy a algoritmy numerické matematiky 15, PANM 15,
Dolni Maxov, Czech Republic (June 0611, 2010).
[slides]
 On efficient numerical approximation of the scattering amplitude,
Seminar on Numerical Analysis (SNA) 2010,
Nove Hrady, Czech Republic (January 18  22, 2010).
[slides]
 On best approximations of matrix polynomials ,
Seminar on Numerical Analysis (SNA) 2009,
Ostrava, Czech Republic (February 26, 2009).
[slides]
 On short recurrences for generating orthogonal Krylov subspace bases,
Seminar on Numerical Analysis (SNA) 2008,
Liberec, Czech Republic (January 28  February 1, 2008).
[slides]
 On ideal GMRES for a Jordan Block ,
Seminar on Numerical Analysis (SNA) 2005,
Ostrava, Czech Republic (February 711, 2005).
 The shadow vector in the Lanczos Method,
XVIIth summer school software and algorithms of numerical math.,
Nečtiny (1999).
other presentations
 Übersicht zur Numerik II für Ingenieure,
(in German), a presentation to the lecture: Numerik II for engineers,
TUBerlin, Germany (2004).
[slides]
 Co Vy na to, pane Gauss,
(in Czech ), Public Days in
the Institute of Computer Science, Prague (2013).
[slides]
[video]

Untraditional derivation of BCG,
CzechUS Workshop on Iterative Methods and Parallel Computing,
MILOVY (1997), poster 3 p.
