Piotr Niemiec
Uniwersytet Jagielloński • Wydział Matematyki i Informatyki • Instytut Matematyki  ()
Jagiellonian University • Faculty of Mathematics and Computer Science • Institute of Mathematics  ()
ul. Łojasiewicza 6 • 30-348 Kraków • Poland
e-mail: MyFirstName.MyLastName @ uj.edu.pl
ORCID: 0000-0003-2393-8299

Publications

43. P. Niemiec
Metric duality for Abelian groups
Topology Appl. 360 (2025), 109155
DOI: 10.1016/j.topol.2024.109155

42. P. Niemiec and P. Pikul
Hyperbolic geometry for non-differential topologists
Math. Slovaca 72 (2022), 165-184
DOI: 10.1515/ms-2022-0012

41. P. Niemiec
Models for subhomogeneous C*-algebras
Colloq. Math. 166 (2021), 75-106
DOI: 10.4064/cm7812-10-2020

40. P. Niemiec
Positive Hankel operators, positive definite kernels and related topics
Adv. Operator Theory 5 (2020), 950-993
DOI: 10.1007/s43036-020-00058-6

39. P. Niemiec and P. Wójcik
Applications of amenable semigroups in operator theory
Studia Math. 252 (2020), 27-48
DOI: 10.4064/sm180408-26-2

38. P. Niemiec
Bounded convergence theorems
J. Korean Math. Soc. 54 (2017), 319-357
DOI: 10.4134/JKMS.j150749

37. P. Niemiec
Non-commutative functional calculus in finite type I von Neumann algebras
Math. Proc. Royal Irish Acad. 116A (2016), 113-147
DOI: 10.3318/pria.2016.116.10

36. P. Niemiec and A. Wegert
Algebra of operators affiliated with a finite type I von Neumann algebra
Univ. Iagellon. Acta Math. 53 (2016), 39-57
DOI: 10.4467/20843828AM.16.005.5377

35. P. Niemiec
Direct integrals of matrices
Israel J. Math. 212 (2016), 507-520
DOI: 10.1007/s11856-016-1298-5

34. P. Niemiec
Elementary approach to homogeneous C*-algebras
Rocky Mountain J. Math. 45 (2015), 1591-1630
DOI: 10.1216/RMJ-2015-45-5-1591

33. P. Niemiec
Functor of extension in Hilbert cube and Hilbert space
Cent. Eur. J. Math. 12 (2014), 887-895
DOI: 10.2478/s11533-013-0386-6

32. P. Niemiec
Isometry groups of proper metric spaces
Trans. Amer. Math. Soc. 366 (2014), 2597-2623
DOI: 10.1090/S0002-9947-2013-05941-7

31. P. Niemiec
Functional calculus for diagonalizable matrices
Linear Multilinear Algebra 62 (2014), 297-321
DOI: 10.1080/03081087.2013.777440

30. P. Niemiec
Isometry groups among topological groups
Pacific J. Math. 266 (2013), 77-116
DOI: 10.2140/pjm.2013.266.77

29. P. Niemiec
Ultrametrics, extending of Lipschitz maps and nonexpansive selections
Houston J. Math. 39 (2013), 1031-1050

28. P. Niemiec
Norm closures of orbits of bounded operators
J. Operator Theory 69 (2013), 339-358
DOI: 10.7900/jot.2010dec27.1919

27. P. Niemiec
Spaces of measurable functions
Cent. Eur. J. Math. 11 (2013), 1304-1316
DOI: 10.2478/s11533-013-0236-6

26. P. Niemiec
Universal valued Abelian groups
Adv. Math. 235 (2013), 398-449
DOI: 10.1016/j.aim.2012.12.005

25. P. Niemiec
Central points and measures, and dense subsets of compact metric spaces
Topol. Methods Nonlinear Anal. 40 (2012), 161-180

24. P. Niemiec
Extending maps in Hilbert manifolds
Bull. Pol. Acad. Sci. Math. 60 (2012), 295-306
DOI: 10.4064/ba60-3-9

23. P. Niemiec
Normal systems over ANR's, rigid embeddings and nonseparable absorbing sets
Acta Math. Sin. (Engl. Ser.) 28 (2012), 1531-1552
DOI: 10.1007/s10114-012-0709-8

22. P. Niemiec
Normed topological pseudovector groups
Appl. Categ. Structures 20 (2012), 303-322
DOI: 10.1007/s10485-010-9239-7; erratum: arXiv:?.?

21. P. Niemiec
Borel parts of the spectrum of an operator and of the operator algebra of a separable Hilbert space
Studia Math. 208 (2012), 77-85
DOI: 10.4064/sm208-1-5

20. P. Niemiec
Problem with almost everywhere equality
Ann. Polon. Math. 104 (2012), 105-108
DOI: 10.4064/ap104-1-8

19. P. Niemiec
Unitary equivalence and decompositions of finite systems of closed densely defined operators in Hilbert spaces
Dissertationes Math. (Rozprawy Mat.) 482 (2012), 1-106
DOI: 10.4064/dm482-0-1

18. P. Niemiec
A note on ANR's
Topology Appl. 159 (2012), 315-321
DOI: 10.1016/j.topol.2011.09.037; erratum: ibid., 2232

17. P. Niemiec
Functor of extension of contractions on Urysohn universal spaces
Appl. Categ. Structures 19 (2011), 959-967
DOI: 10.1007/s10485-009-9218-z

16. P. Niemiec
Generalized absolute values and polar decompositions of a bounded operator
Integral Equations Operator Theory 71 (2011), 151-160
DOI: 10.1007/s00020-011-1896-x

15. P. Niemiec
Strengthened Stone-Weierstrass type theorem
Opuscula Math. 31 (2011), 645-650
DOI: 10.7494/OpMath.2011.31.4.645

14. P. Niemiec
A note on invariant measures
Opuscula Math. 31 (2011), 425-431
DOI: 10.7494/OpMath.2011.31.3.425

13. P. Niemiec
Topological structure of Urysohn universal spaces
Topology Appl. 158 (2011), 352-359
DOI: 10.1016/j.topol.2010.11.011

12. P. Niemiec and T.-Y. Tam
A representation of G-invariant norms for Eaton triple
J. Convex Anal. 18 (2011), 59-65

11. P. Niemiec
Functor of extension of Λ-isometric maps between central subsets of the unbounded Urysohn universal space
Comment. Math. Univ. Carolin. 51 (2010), 541-549

10. P. Niemiec
Ultra-𝔪-separability
Topology Appl. 157 (2010), 669-673
DOI: 10.1016/j.topol.2009.11.009

9. P. Niemiec
Central subsets of Urysohn universal spaces
Comment. Math. Univ. Carolin. 50 (2009), 445-461

8. P. Niemiec
Urysohn universal spaces as metric groups of exponent 2
Fund. Math. 204 (2009), 1-6
DOI: 10.4064/fm204-1-1

7. P. Niemiec
Canonical Banach function spaces generated by Urysohn universal spaces. Measures as Lipschitz maps
Studia Math. 192 (2009), 97-110
DOI: 10.4064/sm192-2-1

6. P. Niemiec
Integration and Lipschitz functions
Rend. Circ. Mat. Palermo 57 (2008), 391-399
DOI: 10.1007/s12215-008-0028-1

5. P. Niemiec
Generalized Haar integral
Topology Appl. 155 (2008), 1323-1328
DOI: 10.1016/j.topol.2008.03.018

4. P. Niemiec
Approximation of the Hausdorff distance by the distance of continuous surjections
Topology Appl. 154 (2007), 655-664
DOI: 10.1016/j.topol.2006.04.020

3. P. Niemiec
Invariant measures for equicontinuous semigroups of continuous transformations of a compact Hausdorff space
Topology Appl. 153 (2006), 3373-3382
DOI: 10.1016/j.topol.2006.01.012

2. P. Niemiec
Locally arcwise connected metrizable spaces with the fixed point property are complete-metrizable
Topology Appl. 153 (2006), 1639-1642
DOI: 10.1016/j.topol.2005.05.003

1. P. Niemiec
Separate and joint similarity to families of normal operators
Studia Math. 149 (2002), 39-62
DOI: 10.4064/sm149-1-3