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Krajíček Jan

Prof., RNDr., DrSc.
Born June 18, 1960 in Prague

  • Member of Learned Society since 2004

Educational and professional preparation

  • 1985, RNDr., Charles University;
  • 1990, CSc., Czechoslovak Academy of Sciences;
  • 1993, DrSc., AS CR;
  • 2002, Associate Professor, CU;
  • 2004, Professor of Mathematical Logic, CU;

Employment and academic positions

  • 1985-present, Academy of Sciences;
  • 2000-present, Charles University;
  • 1988-89, 1990-91, visiting professor, University of Illinois (Urbana-Champaign);
  • 1993, visiting professor (six months), University of Toronto;
  • 1997-99, visiting scholar, Oxford University;
  • 2004 (Spring term), member, Institute for Advanced Study, Princeton.
  • 2006 and 2012 (Spring terms), senior visiting fellow, Isaac Newton Institute, Cambridge.

Membership and positions in international organizations and societies

  • Association for Symbolic Logic Concilium (1999-2001 Council, 2002-2005 Committee on Logic in Europe, 2006-present Committe on Prizes and Awards)
  • Member, American Mathematical Society
  • 2009-present, Panel Member for the ERC Advanced Grant evaluation
  • Member, editorial boards, Annals of Pure and Applied Logic, Notre Dame Journal of Formal Logic, Archive for Mathematical Logic, and Mathematical Methods in Computer Science
  • over the years, member of program/organization committees of over 30 international conferences

Notable awards

  • 1994, Award, young scientific workers, AS CR
  • 1998, Award, Minister of Education, Youth and Sports (for Science)
  • 2010, Award of the Academy of Sciences of the Czech Republic

Selected publications

  • J. Krajíček: On the Number of Steps in Proofs. Annals of Pure and Applied Logic 41(2), 153-178, (1989)
  • J. Krajíček, P. Pudlák and G. Takeuti: Bounded Arithmetic and the Polyno-mial Hierarchy, Annals of Pure and Applied Logic 52, 143-153, (1991).
  • J. Krajíček: Fragments of Bounded Arithmetic and Bounded Query Classes, Transactions of the AMS 338(2), 587-598, (1993).
  • J. Krajíček: Lower Bounds to the Size of Constant-Depth Propositional Proofs. J. of Symbolic Logic 59(1), 73-86, (1994).
  • J. Krajíček, P. Pudlák and A. Woods: An Exponential Lower Bound to the Size of Bounded Depth Frege Proofs of the Pigeonhole principle. Random Structures and Algorithms 7(1), 15-39,(1995).
  • P. Beame, R. Impagliazzo, J. Krajíček, T. Pitassi and P. Pudlák: Lower bounds on Hilbert.s Nullstellensatz and propositional proofs. Proceedings of the London Mathematical Society 73(3), 1-26, (1996).
  • J. Krajíček: Interpolation theorems, lower bounds for proof systems, and independence results for bounded arithmetic. J. of Symbolic Logic, 62(2), 457-486, (1997).
  • J. Krajíček a P. Pudlák: Some consequences of cryptographical conjectures for S12 and EF. Information and Computation 140 (1), 82-94, (1998).
  • J. Krajíček: Dual weak pigeonhole principle, pseudo-surjective functions, and provability of circuit lower bounds, J. of Symbolic Logic, 69(1), 265-286, (2004).
  • J. Krajíček: An exponential lower bound for a constraint propagation proof system based on ordered binary decision diagrams, J. of Symbolic Logic, 73(1), 227-237, (2008).
  • J. Krajíček: Bounded arithmetic, propositional logic, and complexity theory, Cambridge University Press, 1995.
  • J. Krajíček: Forcing with random variables and proof complexity, Cambridge University Press, 2011.

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News

20.05.19

XXV. General Assembly of the Learned Society of the Czech Republic

The ceremonial part of the XXV. General Assembly of the Learned Society, at which the Medals of the Learned Society of the Czech Republic Societas Scientarium Bohemica Ad Laudem et Honorem and the awards of the Learned Society of the Czech Republic in the “Young Scientist” and “Grammar School Student” categories were presented, took place on Monday 20 May 2019 in the Great Hall of the Carolinum.

19.05.19

Bolzano lecture by prof. Kip S. Thorne

American physicist Kip S. Thorne, recipient of the Nobel Prize for 2017 for detection of gravitational waves, visited Prague at the invitation of he Learned Society. He held a series of “Bolzano lectures” and a lecture titled “Creating Gravitational-Wave Astronomy” for the Learned Society on 15 May 2019 in the Blue Auditorium of the Carolinum. The lecture was held with the support of the Karel Janeček Foundation and was received very enthusiastically.

07.05.19

XXV. General Assembly

The Czech Learned Society is holding its XXV. General Assembly on 20 and 21 May 2019. The Learned Society’s awards in the “Young Scientist” and “Grammar School Student” categories, Teaching Awards for pedagogic workers who promote interest in science and research at grammar schools and the Learned Society’s medals for meritorious contributions to the advance of science will be presented during a ceremony on 20 May at the Karolinum. Lectures by renowned scientists will also be presented. The second day will be reserved for the working part of the meeting, in the building of the Academy of Sciences of the Czech Republic.