Conferences

Members of our group participated in the following conferences.

2024

60th International Symposium on Functional Equations, Będlewo (Poland), Kościelisko (Poland), June 9-15, 2024

• Dorota Głazowska "Weakly associative means"
• Justyna Jarczyk "Complex-valued solutions of an iterative functional equation of finite order"
• Witold Jarczyk "On an extension procedure for solutions of simultaneous q-difference equations"
• Tomasz Małolepszy "Separate and joint continuity of means"
• Janusz Matkowski "Lipschitz mappings and fixpoint principle in metrically convex spaces"

24th European Conference on on Iteration Theory (ECIT2024), Vimeiro (Portugal), May 27-31, 2024

• Dorota Głazowska "Subcommutativity of integrals similar to integral quasi-arithmetic means"
• Justyna Jarczyk "Complex-valued solutions of an iterative functional equations of finite order"
• Witold Jarczyk "Iterative roots of piecewise monotonic functions extended from the characteristic interval"

2023

20th International Conference on Functional Equations and Inequalities, Będlewo (Poland), September 17-23 2023

• Dorota Głazowska "Subcommutativity of integrals similar to integral quasi-arithmetic means"
• Justyna Jarczyk " On a linear iterative equation of finite order and its solutions with a prescribed asymptotics"
• Witold Jarczyk "Iterative roots of piecewise monotonic functions extended from the characteristic interval"

59th International Symposium on Functional Equations, Hajdúszoboszló (Hungary), 19-26 June 2022

• Witold Jarczyk "On a functional equation characterizing some probability distributions"

2022

58th International Symposium on Functional Equations, Innsbruck (Austria), 19-26 June 2022

• Dorota Głazowska "Invariance equations involving generalized classical weighted means"
• Justyna Jarczyk "On various concepts of means and iterates of maps built of them, part I"
• Witold Jarczyk "On various concepts of means and iterates of maps built of them, part II"

European Conference on Iteration Theory, Reichenau an der Rax (Austria), 13-17 July 2022

• Witold Jarczyk "Gaussian iterative algorithm for various notions of means"

2021

19th International Conference on Functional Equations and Inequalities, Będlewo (Poland), September 12-18, 2021

• Dorota Głazowska "Generalized classical weighted means and some related problems"
• Justyna Jarczyk "On generalized Archimedes-Borchardt algorithm"
• Witold Jarczyk "Form of semiflows of pairs of weighted quasi-arithmetic means"
• Janusz Matkowski "Remarks on a fixed point theorem"

26th International Conference on Difference Equations and Applications, Sarajewo (Bosnia and Herzegovina), July 26-30, 2021

• Witold Jarczyk "On generalized Archimedes-Borchardt algorithm"

2020

20th Debrecen--Katowice Winter Seminar on Functional Equations and Inequalities, Hajdúszoboszló (Hungary), January 29-February 1, 2020

• Justyna Jarczyk "On a functional equation appearing on the margins of a mean invariance problem"
• Witold Jarczyk

2019

Dynamics, Equations and Applications (DEA 2019), Kraków (Poland), September 16-20, 2019

• Dorota Głazowska "Embeddability of pairs of weighted quasi-arithmetic means into a semiflow"
• Justyna Jarczyk "Gaussian algorithm for mappings built of parametrized means"
• Witold Jarczyk "Generalized Gaussian algorithm"

18th International Conference on Functional Equations and Inequalities (ICFEI'19), Kraków (Poland), June 9-15, 2019

• Mariusz Sudzik "Iterative functional equations and attractive fixed points"

57th International Symposium on Functional Equations, Jastarnia (Poland), June 2-9, 2019

• Dorota Głazowska
• Justyna Jarczyk
• Witold Jarczyk
• Tomasz Małolepszy "On Walter-Weckesser theorem"
• Mariusz Sudzik "The archetypal equation and its solutions attaining the global extremum"

24th International Conference on Mathematical Modelling and Analysis, Tallinn (Estonia), May 28-30, 2019

• Tomasz Małolepszy "On Bushell-Okrasiński inequality"

Progress on Difference Equations (PODE 2019), Bragança (Portugal), May 27-30, 2019

• Dorota Głazowska "Convexity in the class of weighted quasi-arithmetic means"
• Justyna Jarczyk "Generalized Gaussian algorithm"
• Witold Jarczyk "On some simultaneous geometric di↵erence equations"

2018

Numbers, Functions, Equations 2018, Hajdúszoboszló (Hungary), August 26 - September 1, 2018

• Dorota Głazowska "On weighted quasi-arithmetic means which are convex"
• Witold Jarczyk "Continuous solutions of some simultaneous difference equations on a restricted domain"

European Conference on Iteration Theory, Murcia (Spain), 3-6 July 2018

• Justyna Jarczyk "Joining means by iteration"
• Witold Jarczyk "Iterative roots of pairs of weighted quasi-arithmetic means and embeddability of such pairs into a semiflow"

56th International Symposium on Functional Equations, Graz (Austria), June 17-24, 2018

• Dorota Głazowska "Invariance of quasi-arithmetic mean with respect to a pair of weighted Bajraktarević means"
• Justyna Jarczyk "On symmetry of Makó-Páles means"
• Witold Jarczyk "Simultaneous difference equations on a restricted domain"
• Mariusz Sudzik "A problem of G. Derfel and its partial solution"

Dynamical Systems, Difference and Functional Equations. In honor of Marek C. Zdun's 70th birthday, Krynica-Zdrój (Poland), June 4-8, 2018

• Dorota Głazowska "Invariance of quasi-arithmetic mean with respect to weighted Bajraktarević mean-type mappings"
• Justyna Jarczyk "Joining means by iteration"
• Witold Jarczyk "Embeddability of pairs of weighted quasi-arithmetic means in a semiflow"
• Mariusz Sudzik "An equation with rescaling and its solutions attaining an absolute extreme"

23rd International Conference on Mathematical Modelling and Analysis, Sigulda (Latvia), May 29 - June 1, 2018

• Tomasz Małolepszy "Volterra integral equations in the nonlinear diffusion theory"

2017

International Conference on Analysis and Its Applications, Aligarh (Indie), 20-22 November, 2017

• Witold Jarczyk "On weighted quasi-arithmetic mean which are convex"

Topics in Complex Dynamics, Barcelona (Spain), 2-6 October, 2017

• Martin Himmel "Some properties of Cauchy quotient means"

XII International Symposium on Generalized Convexity and Monotonicity, Hajdúszoboszló (Hungary), August 27-September 2, 2017

• Dorota Głazowska "Convex means"
• Justyna Jarczyk "Convex means"
• Witold Jarczyk "Convexity in abelian semigroups"

Positivity IX, Edmonton (Canada), 17-21 July 2017

• Martin Himmel "Cauchy quotient means and their properties"

17th International Conference on Functional Equations and Inequalities, Będlewo (Poland), 9-15 July 2017

• Mariusz Sudzik "On a problem of Derfel"

55th International Symposium on Functional Equations, Chengdu (China), 11-18 June 2017

• Dorota Głazowska "Subcommutativity of integral quasi-arithmetic means on measure spaces"
• Martin Himmel "Some properties of Cauchy quotient means"
• Justyna Jarczyk "Joining means by iteration"
• Witold Jarczyk "Embeddability of pairs of weighted quasi-arithmetic means in a semiflow"
• Janusz Matkowski

Progress on Difference Equations 2017, Urbino (Italy), 29-31 May 2017

• Dorota Głazowska "Embeddability of pairs of weighted quasi-arithmetic means in a semiflow"
• Justyna Jarczyk "Embeddability of pairs of weighted quasi-arithmetic means in a semiflow"
• Witold Jarczyk "Iterated procedure of joining means"
• Mariusz Sudzik "On a problem of Derfel"

2016

21st European Conference on Iteration Theory, Innsbruck (Austria), 4-10 September 2016

• Dorota Głazowska "Iterative roots of some mean-type mappings"
• Justyna Jarczyk "Iterated joining means"
• Witold Jarczyk "On a linear iterative functional equation with commuting given functions"
• Janusz Matkowski "Beta-type functions and means"

Conference on Inequalities and Applications, Hajdúszoboszló (Hungary), August 28 - September 3, 2016

• Witold Jarczyk "Convex functions in abelian semigroup setting"
• Janusz Matkowski "On some applications of a sandwich theorem"

54th International Symposium on Functional Equations, Hajdúszoboszló (Hungary), 12-19 June 2016

• Dorota Głazowska "Regularity theorem for a problem of the invariance in the class of Lagrange means"
• Martin Himmel "Beta-type functions and means"
• Justyna Jarczyk "Joining means"
• Witold Jarczyk "On some properties of strictly convex functions"
• Janusz Matkowski
• Tomasz Małolepszy "On the translativity of beta-type functions"

Progress on Difference Equations 2016, Riga (Latvia), 17-20 May 2016

• Dorota Głazowska "Flows of homographies"
• Justyna Jarczyk "Fractional Iterates of Piecewise Monotonic Functions of Nonmonotonicity Height Not Less than 2 – Part II"
• Witold Jarczyk "Fractional Iterates of Piecewise Monotonic Functions of Nonmonotonicity Height Not Less than 2 – Part I"

2015

Mathematical Inequalities and Applications 2015, Mostar (Bosnia and Herzegovina), 11-15 November, 2015

• Witold Jarczyk "On some properties of strictly convex functions"

Function Spaces XI, Zielona Góra (Poland), 6-10 July 2015

• Dorota Głazowska "Uniformly bounded composition operators in the Banach space of absolutely continuous functions"
• Martin Himmel "Directional convexity and characterizations of Beta and Gamma functions"
• Justyna Jarczyk "Uniform convexity of paranormed generalizations of L^p spaces"
• Janusz Matkowski "Paranormed generalizations of L^p spaces"

2nd International Conference on New Trends of Differential Equations in Sciences, Sofia (Bulgaria), 6-10 July 2015

• Tomasz Małolepszy "Some results from the theory of blow-up solution to a certain class of Volterra integral equation"

53rd International Symposium on Functional Equations, Krynica-Zdrój (Poland), 14-21 June 2015

• Dorota Głazowska "Subcommuting and commuting real homographic functions"
• Justyna Jarczyk "On marginal joints of means"
• Witold Jarczyk "Convexity in an abelian semigroup setting"
• Janusz Matkowski "Commutativity of integral quasi-arithmetic means on probability spaces"

20th International Conference on Mathematical Modelling and Analysis, Sigulda (Latvia), 26-29 May 2015

• Tomasz Małolepszy "Blow-up solutions to a certain class of Volterra integral equations"

16th International Conference on Functional Equations and Inequalities, Będlewo (Poland), 17-23 May 2015

• Dorota Głazowska "Subcommuting real homographic functions"
• Matrin Himmel
• Justyna Jarczyk "Around a problem of Zoltán Daróczy"
• Witold Jarczyk "On some properties of strictly convex functions"
• Tomasz Małolepszy "The application of the Schröder equation in the theory of blow-up solutions for Volterra integral equations"
• Janusz Matkowski "Directional convexity and characterizations of Beta and Gamma functions"

2014

20th European Conference on Iteration Theory, Łagów (Poland), 14-20 September 2014

• Dorota Głazowska "Commuting real homographic functions"
• Justyna Jarczyk "Parametrized means and their Gauss compositions"
• Witold Jarczyk "Iterative roots of piecewise monotonic functions of nonmonotonicity height not less than 2 revisited"
• Dorota Krassowska "Embeddability of homeomorphisms of the circle in set-valued iteration groups"
• Janusz Matkowski "Homographic commuting functions"
• Łukasz Sadowski "Takagi function as a unique solution of some functional equations"

IX Forum Równań Różniczkowych Cząstkowych, Będlewo (Poland), 1-5 September 2014

• Tomasz Małolepszy "Szacowanie czasu wybuchu rozwiązań dla pewnej klasy równań całkowych Volterry - podejście "całkowe""

XI International Symposium on Generalized Convexity and Monotonicity, Rio de Janeiro, (Brazil), 25-29 August 2014

• Justyna Jarczyk "Uniform convexity of paranormed generalizations of L^p spaces"
• Witold Jarczyk "Convexity and a Stone-type theorem for convex sets in Abelian semigroup setting"

52nd International Symposium on Functional Equations, Innsbruck (Austria), 22-29 June 2014

• Dorota Głazowska "Invariance equation involving Matkowski means"
• Justyna Jarczyk "Parametrized means and their Gauss compositions"
• Witold Jarczyk "Convexity on groups" survey talk
• Janusz Matkowski "Invariance formulas for weighted quasi-arithmetic means of bounded sequences"

2013

Numbers, Functions, Equations 2013 (NFE'13), Visegrád (Hungary), 28-30 June 2013

• Dorota Głazowska "Invariance of the quasi-arithmetic mean in the class of generalized weighted quasi-arithmetic means"
• Justyna Jarczyk "Conditional homogenity and translativity of Makó-Páles means"
• Witold Jarczyk "Uniqueness of solutions of simultaneous difference equations"
• Janusz Matkowski "Invariance formula for generalized quasi-arithmetic means"

51st International Symposium on Functional Equations, Rzeszów (Poland), 16-23 June 2013

• Justyna Jarczyk "Uniform convexity of finite dimensional paranormed spaces"
• Witold Jarczyk "On some functional equations stemming from probability theory"
• Janusz Matkowski "Continuity of monotonic and homogeneous functions of several variables"

15th International Conference on Functional Equations and Inequalities, Ustroń (Poland), 19-25 May 2013

• Dorota Głazowska "Invariance equation involving quasi-arithmetic mean and Matkowski means"
• Hideaki Izumi "Formal series solutions of iterative functional equations"
• Justyna Jarczyk "Uniform convexity of paranormed generalizations of L^p spaces"
• Witold Jarczyk "Iterative roots of piecewise monotonic functions revisited"
• Tomasz Małolepszy "Schröder equation and the existence of the blow-up solutions of some class of Volterra integral equations"
• Janusz Matkowski "Continuity of means and uniqueness of invariant means"

2012

European Conference on Iteration Theory, Ponta Delgada (Azory, Portugalia), 9-15 September 2012

• Justyna Jarczyk "The convergence of iterates of random mean-type mappings"
• Witold Jarczyk "Recent results on iterative roots" survey talk
• Dorota Krassowska "On the embeddability of continuous mappings In shorten iteration semigroups"
• Janusz Matkowski "Iterations of pre-mean-type mappings"

XLI Polish Conference of Applied Mathematics, Zakopane-Kościelisko (Polska), 4 - 11 September, 2012

• Tomasz Małolepszy "The analysis of the existence of blow-up solutions in some model of superdiffusion"

50th International Symposium on Functional Equations, Hajdúszoboszló (Węgry), 17-24 June 2012

• Justyna Jarczyk "Random means"
• Witold Jarczyk "Improving regularity of solutions of difference equation"
• Janusz Matkowski "Convergence of iterates of pre-mean-type mapping"

VIII Forum on Partial Differential Equations, Będlewo (Polska), 17 - 22 June 2012

• Tomasz Małolepszy "Blow-up solutions in diffusion models"

2011

14th International Conference on Functional Equations and Inequalities, Będlewo (Poland), 11-17 September 2011

• Dorota Głazowska "Uniformly bounded composition operators in the space of functions of bounded $\varphi$-variation with weight in the sense of Riesz"
• Justyna Jarczyk "On some equality problem connected with conjugate means"
• Witold Jarczyk "Note on an equation occuring in a problem of Nicole Briouet-Belluot"

49th International Symposium on Functional Equations, Graz (Austria), 19-26 June 2011

• Justyna Jarczyk "On a functional equation connected with conjugate means"
• Witold Jarczyk "Convexity and almost convexity in Abelian groups"
• Dorota Krassowska "On conjugacy of regular iteration groups with two fixed points"
• Janusz Matkowski "Pointwise monotonicity and generalized subadditive functions"

11st Katowice-Debrecen Winter Seminar on Functional Equations and Inequalities, Wisła Malinka (Poland), 2-5 February 2011

• Janusz Matkowski "Generalized subadditive function - monotonicity and periodicity"

2010

18th European Conference on Iteration Theory, Nant (France), 12-17 September 2010

• Justyna Jarczyk "Iterative roots of piecewise monotonic functions of nonmonotonicity height not less than 2, part II"
• Witold Jarczyk "Iterative roots of piecewise monotonic functions of nonmonotonicity height not less than 2, part I"
• Dorota Krassowska "On C^1 iteration groups with two fixed points"
• Janusz Matkowski "Mean-type mappings and invariant curves"

48th International Symposium on Functional Equations, Batz-sur-Mer (France), 13-18 June 2010

• Justyna Jarczyk "On an equation involving weighted quasi-arithmetic means"
• Witold Jarczyk "On a functional equation in probability theory"
• Janusz Matkowski

2009

9th Katowice-Debrecen Winter Seminar on Functional Equations and Inequalities, Będlewo (Poland), 4-7 February 2009

• Janusz Matkowski "On composition operators"

13th International Conference on Functional Equations and Inequalities, Małe Ciche (Poland), 13-19 September 2009

• Dorota Głazowska "An invariance of the geometric mean with respect to the Cauchy mean-type mappings"
• Dorota Krassowska "On iteration semigroups containing generalized convex and concave functions"

2008

8th Debrecen-Katowice Winter Seminar on Functional Equations and Inequalities, Poroszló (Hungary), 30 January- 2 February 2008

• Janusz Matkowski "A converse of Hölder inequality theorem"

Numbers, Functions, Equations, 08, Noszvaj (Hungary),15-21 June 2008

• Justyna Jarczyk "Regularity theorem for a functional equation involving means"
• Witold Jarczyk "Convex functions and almost convex functions on Abelian groups"
• Janusz Matkowski "On invariant means"

46th International Symposium on Functional Equations, Opava (Czech Republic), 22-29 June 2008

• Justyna Jarczyk "On an equation involving weighted quasi-arithmetic means with continuous generators"
• Witold Jarczyk "Iterative roots of mappings with a unique set-value point"
• Dorota Krassowska "On the embeddability of commuting continuous injections in an iteration semigroup"
• Janusz Matkowski "Invariance of means with two generators with respect to some one-generator means"

12th International Conference on Functional Equations and Inequalities, Będlewo (Poland), 7-13 September 2008

• Dorota Głazowska "An invariance of the geometric mean in the class of Cauchy means"
• Justyna Jarczyk "On an equation involving weighted quasi-arithmetic means"
• Witold Jarczyk "Iterability in a class of mean-type mappings"

17th European Conference on Iteration Theory, Jałta (Ukraine), 7-13 September 2008

• Dorota Krassowska "On iteration groups containing generalized convex and concave functions"
• Janusz Matkowski "Iterations of the mean-type mappings"

2007

7th Katowice-Debrecen Winter Seminar on Functional Equations and Inequalities, Będlewo (Poland), 31 January-3 February 2007

• Janusz Matkowski "On a generalization of Lagrange and Cauchy mean-value theorems"

45th International Symposium on Functional Equations, Bielsko-Biała (Poland), 24 June -1 July 2007

• Justyna Jarczyk "Invariance in the class of Bajraktarević means"
• Witold Jarczyk "Convexity and almost convexity on Abelian groups"
• Witold Jarczyk "On stability of random variables via functional equations"
• Dorota Krassowska "On simultaneous Abel's functional inequalities"
• Janusz Matkowski "Jensen functional equation and uniformly continuous Nemytskii operators"

Conference on Inequalities and Applications '07, Noszvaj (Hungary), 9-15 September 2007

• Janusz Matkowski "Uniformly continuous Nemytskii operators in some function spaces"

2006

6th Debrecen-Katowice Winter Seminar on Functional Equations and Inequalities, Berekfürdő (Hungary), 1-4 February, 2006

• Janusz Matkowski "On a generalized Gołąb-Schinzel equation"

11th International Conference on Functional Equations and Inequalities, Będlewo (Poland), 17-23 September 2006

• Dorota Głazowska "An invariance of geometric mean with respect to Lagrangean means"
• Justyna Jarczyk "Invariance in the class of quasi-arithmetic means with function weights"
• Witold Jarczyk "Almost convex functions on Abelian groups"
• Dorota Krassowska "On a nonlinear simultaneous system of functional inequalities"
• Janusz Matkowski "On extension of solutions of simultaneous systems of functional equations"

44th International Symposium on Functional Equations, May 2006, Louisville KY (USA)

• Witold Jarczyk "On a problem of N. Brillouët-Belluot"
• Janusz Matkowski "Simultaneous system of functional equations and commuting functions"

16th European Conference on Iteration Theory, Gargnano (Italy), 10-16 September 2006

• Witold Jarczyk "Continuity of semiflows"
• Dorota Krassowska "Iteration groups and commuting functions in the space R^n"
• Janusz Matkowski "Simultaneous system of functional equations and commuting functions"

The 30th Anniversary of Postgrado of Mathematics, Caracas (Wenezuela), 23-29 October 2006

• Janusz Matkowski "On Lipschitzian Nemytskii operators"
• Janusz Matkowski "Iteration of means"

2005

10th International Conference on Functional Equations and Inequalities, Będlewo (Poland), 11-17 September 2005

• Dorota Głazowska "Invariance of the geometric mean with respect to Lagrangean conditionally homogeneous mean-type mappings"
• Justyna Jarczyk "Invariance in the class of weighted quasi-arithmetic means with continuous generators"
  
• Witold Jarczyk "Convexity on Abelian groups"
• Dorota Krassowska "On a system of functional inequalities of iterative type"
• Janusz Matkowski "On a generalized Gołąb-Schinzel functional equation"

43th International Symposium on Functional Equations, Batz-sur-Mer (France), May 2005

• Dorota Krassowska "A pair of functional inequalities of iterative type characterizing polynomials"
• Witold Jarczyk "Also set-valued functions do not like iterative roots"
• Janusz Matkowski "On generalized Jensen functions"

2004

15th European Conference on Iteration Theory, Batschuns (Austria), 29 August - 04 September 2004

• Witold Jarczyk "On continuity of solutions to some equations of iteration theory"
• Janusz Matkowski

42th International Symposium on Functional Equations, Opava (Czech Republic), 20-27 June 2004

• Dorota Krassowska "A system of functional inequalities of iterative type and a characterization of affine functions in R^n"
• Witold Jarczyk "Non-negative solutions of some linear iterative equations, part I"
• Janusz Matkowski "Embedding of Cauchy mean into family of weighted means"