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Darcy Jech Jiří Jech (born 1975), Czech football referee Josef Jech Thomas Jech (born 1944), mathematician All pages with titles containing Jech All pages
Jech
Tree in set theory
A Jech–Kunen tree is a set-theoretic tree with properties that are incompatible with the generalized continuum hypothesis. It is named after Thomas Jech
Jech–Kunen_tree
Czech mathematician
Thomas J. Jech (Czech: Tomáš Jech, pronounced [ˈtomaːʃ ˈjɛx]; born 29 January 1944 in Prague) is a mathematician specializing in set theory who was at
Thomas_Jech
American politician
Darcy Allen Jech (born September 30, 1957) is an American politician serving as a Republican member of the Oklahoma Senate, representing the 26th district
Darcy_Jech
Size of a set in mathematics
& Jech 2017, p. 66 Takeuti & Zaring 1982, p. 83 Abbott 2015, p. 36 Abbott 2015, p. 32 Dasgupta 2013, pp. 109–111 Hrbáček & Jech 2017, pp. 66–68 Jech 2008
Cardinality
Czech ice hockey player
Ctibor Jech (born 28 August 1983) is a Czech former professional ice hockey player who played mainly with HC Bílí Tygři Liberec in the Czech Extraliga
Ctibor_Jech
Czech football referee
Jiří Jech (born 22 December 1975) is a Czech football referee. He was a full international for FIFA from 2007 to 2010, and served as a referee in 2010
Jiří_Jech
Jech v. Burch, 466 F. Supp. 714 (D. Haw. 1979), was a United States federal district court case that in its ruling affirmed the constitutional right of
Jech_v._Burch
Set-theoretic concept
[X]^{\lambda }=\{Y\subseteq X:|Y|=\lambda \}} . This notion is due to Thomas Jech. As before, S ⊆ [ X ] λ {\displaystyle S\subseteq [X]^{\lambda }} is stationary
Stationary_set
Natural region in Punjab
Chaj Doab (Punjabi: چَج دوآب), also known as the Jech Doab, is one of the main regions of the Punjab province in Pakistan. The doab lies between the Chenab
Chaj_Doab
Set-theoretic tree with uncountable branches
unpublished work that there are Kurepa trees in Gödel's constructible universe (Jech 1971). More precisely, the existence of Kurepa trees follows from the diamond
Kurepa_tree
Axiom of Zermelo-Fraenkel set theory
Nostrand Company. Reprinted 1974 by Springer-Verlag. ISBN 0-387-90092-6. Thomas Jech (2003) Set Theory: The Third Millennium Edition, Revised and Expanded. Springer-Verlag
Axiom_of_infinity
Portrayal of sexual subject matter
Journal of Epidemiology and Community Health. 70 (1): 3–5. doi:10.1136/jech-2015-205453. PMID 26022057. Langenberg, Amy Paris (2015). "Sex and Sexuality
Pornography
Mathematical logic concept
absolute to all transitive models of set theory, including the following (see Jech (2003 sec. I.12) and Kunen (1980 sec. IV.3)). x is the empty set. x is an
Absoluteness_(logic)
Generalization of "n-th" to infinite cases
19. Jech 2003, p. 20. Jech 2003, Theorem 2.12. Holz, Steffens & Weitz 1999. Jech 2003, p. 23. Just & Weese 1996, p. 36. Rosenstein 1982. Jech 2003,
Ordinal_number
Country in Eastern Europe and North Asia
Journal of Epidemiology and Community Health. 74 (9): 698–704. doi:10.1136/jech-2020-213885. PMC 7577103. PMID 32414935. McKee, Martin (1 November 1999)
Russia
Set of all things that may be the input of a mathematical function
1997, p. 91 (quote 1, quote 2); Mac Lane 1998, p. 8; Mac Lane, in Scott & Jech 1971, p. 232; Sharma 2010, p. 91; Stewart & Tall 1977, p. 89 Bourbaki, Nicolas
Domain_of_a_function
Set theory method
definition of equivalence classes for equivalence relations on a proper class (Jech 2003:65) by referring to levels of the cumulative hierarchy. The method relies
Scott's_trick
Village in Punjab, Pakistan
of Tehsil Malakwal and lies between the Jhelum and Chenab rivers in the Jech Doab region. The origins of Busal trace back several centuries, with local
Busal
English and Scottish surname
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Johnson_(surname)
Target set of a mathematical function
1997, p. 91 (quote 1, quote 2); Mac Lane 1998, p. 8; Mac Lane, in Scott & Jech 1967, p. 232; Sharma 2004, p. 91; Stewart & Tall 1977, p. 89 Bourbaki, Nicolas
Codomain
Axiom of Set Theory
Research Lab, Stanford University, retrieved 2024-06-10 Hrbacek, Karel; Jech, Thomas J. (1999). Introduction to set theory. Pure and applied mathematics
Axiom_of_empty_set
International football competition
2009 18:00 CET RSC Olimpiyskiy, Donetsk Attendance: 12,800 Referee: Jiří Jech (Czech Republic) 24 July 2009 16:00 CET Metalurh Stadium, Donetsk Attendance:
2009 UEFA European Under-19 Championship
2009_UEFA_European_Under-19_Championship
Set theory concept
certain cofinal subsets of ω ω {\displaystyle {}^{\omega }\omega } . In T. Jech (ed), Axiomatic Set Theory, Part II. Volume 13(2) of Proc. Symp. Pure Math
Cardinal characteristic of the continuum
Cardinal_characteristic_of_the_continuum
Axiom of set theory
over all formulas of a particular logical form. Zermelo 1904. Jech 1977, p. 351. Jech 1977, p. 348 ff; Mac Lane 1986, pp. 366–367; Martin-Löf 2008, p
Axiom_of_choice
Infinite set that is not countable
by Martino Fine Books, 2011. ISBN 978-1-61427-131-4 (Paperback edition). Jech, Thomas (2002), Set Theory, Springer Monographs in Mathematics (3rd millennium ed
Uncountable_set
Possible axiom for set theory
Mathematical Society. 2 (1): 71–125. doi:10.2307/1990913. JSTOR 1990913. Jech, Thomas (2002). Set theory, third millennium edition (revised and expanded)
Axiom_of_determinacy
Act of sexual abuse
Journal of Epidemiology & Community Health. 59 (10): 818–21. doi:10.1136/jech.2004.022756. PMC 1732916. PMID 16166351. "Sapphire". Metropolitan Police
Sexual_assault
Boolean algebra of Borel subsets of the reals modulo meager sets (Balcar & Jech 2006). It is isomorphic to the completion of the countable Cantor algebra
Cantor_algebra
Caucus Vice Chair Warren Hamilton Republican 7 Rural Caucus Chair Darcy Jech Republican 26 Democratic Leader Julia Kirt Democratic 30 Democratic Caucus
List of current members of the Oklahoma Senate
List_of_current_members_of_the_Oklahoma_Senate
Anti-Capitalist cartoon caricature from 1911
Journal of Epidemiology & Community Health. 62 (12): 1098–1104. doi:10.1136/jech.2008.079061. PMID 19008371. S2CID 44715620. "Labor Arts". Labor Arts. Archived
Pyramid_of_Capitalist_System
In fact, S contains a closed subset of order type ω1. Jech 2003, p. 684. Jech 2003, p. 685. Jech 2003, p. 687. Foreman, M.; Magidor, M.; Shelah, Saharon
Martin's_maximum
Journal of Epidemiology and Community Health. 62 (4): 351–357. doi:10.1136/jech.2006.056457. PMID 18339829. S2CID 24602487. "Qatar STEPwise report, chronic
Human_height_by_country
Videoconferencing software
release 1.0 / 9 August 2025 Written in Go, JavaScript Type Videoconferencing License MIT License Website galene.org Repository github.com/jech/galene
Galene_(software)
Surname list
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Janssen_(surname)
Concept in axiomatic set theory
Theory. Courier Corporation. pp. 6, 19, 21, 237. ISBN 978-0-486-61630-8. Jech, Thomas J. (2006). Set Theory: The Third Millennium Edition, Revised and
Axiom_schema_of_specification
Surname list
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Hovhannisyan
Name list
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Bevin_(name)
Family name
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Yanukovych_(surname)
Sporting event
2024-04-25. "ECh and JECh results 2000" (PDF). "ECh and JECh results 2002" (PDF). European Gymnastics. Retrieved 2024-04-25. "ECH and JECh results 2004" (PDF)
European Trampoline Championships
European_Trampoline_Championships
Given name
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
John_(given_name)
Yeshiva high school in Union County, New Jersey, United States
Thunder, Chargers Accreditation Middle States Association of Colleges and Schools Newspaper The Jolt, B'Kol Ram Tuition $22,000 (2021-22) Website jechs.org
Rav_Teitz_Mesivta_Academy
Problem in set theory
trees and to Suslin algebras. The Suslin hypothesis is independent of ZFC. Jech (1967) and Tennenbaum (1968) independently used forcing methods to construct
Suslin's_problem
Name list
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Hone_(name)
Name list
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
FitzJohn_(name)
Name list
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Yahya_(name)
Region in Punjab, Pakistan
rivers Jhelum and Chenab. It comprises the central and southern parts of Jech Doab, and corresponds to the present-day Mandi Bahauddin, Sargodha and Gujrat
Kirana_Bar
Set theory concept
Foundations of Mathematics; V. 76). Elsevier Science Ltd. ISBN 0-444-10535-2. Jech, Thomas (2002). Set theory, third millennium edition (revised and expanded)
Large_cardinal
Surname list
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Johns_(surname)
Any one of the distinct objects that make up a set in set theory
axiomatized, not that it is silly or easy (Halmos's treatment is neither). Jech, Thomas (2002), "Set Theory", Stanford Encyclopedia of Philosophy, Metaphysics
Element_of_a_set
Condition in order theory and topology
Lindelöf. An example of a topological space with the ccc is the real line. Jech, Thomas (2003), Set Theory: Millennium Edition, Springer Monographs in Mathematics
Countable_chain_condition
Finite ordered list of elements
Georg Cantor Paul Cohen Richard Dedekind Abraham Fraenkel Kurt Gödel Thomas Jech John von Neumann Willard Quine Bertrand Russell Thoralf Skolem Ernst Zermelo
Tuple
Informal set theories
1974, p. 10. Jech 2002, p. 4. Halmos 1974, Chapter 2. Halmos 1974, See discussion around Russell's paradox. Jech 2002, Section 1.6. Jech 2002, p. 61.
Naive_set_theory
Set theory concept
The notion in the article Ulam number is different. Maddy 1988 Jech 2002 Ulam 1930 T. Jech, "The Brave New World of Determinacy" (PDF download). Bulletin
Measurable_cardinal
Parts of western Punjab
Sheikhupura 1,824,745 Chunian 1896–98 1904-05 Bari Lahore 102,500 Jhelum 1902-06 Jech Shapur, Jhang 540,000 Lower Bari Doab 1914-24 Bari Montgomery, Multan 1,192
Punjab_Canal_Colonies
Set whose elements all belong to another set
Weisstein, Eric W. "Subset". mathworld.wolfram.com. Retrieved 2020-08-23. Jech, Thomas (2002). Set Theory. Springer-Verlag. ISBN 3-540-44085-2. Media related
Subset
Name list
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Johannes
Concept in axiomatic set theory
Springer-Verlag, New York, 1974. ISBN 0-387-90092-6 (Springer-Verlag edition). Jech, Thomas, 2003. Set Theory: The Third Millennium Edition, Revised and Expanded
Axiom_of_power_set
Decline in the number of friends people have
Journal of Epidemiology and Community Health. 76 (2): 128–132. doi:10.1136/jech-2021-216690. PMC 8380476. PMID 34413184. "How COVID-19 has reshaped our friendships"
Friendship_recession
Surname list
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Jonczyk
Thus, a maximal set exists, which must then span V and be a basis for V. Jech, Thomas J. (2008) [1973]. The Axiom of Choice. Dover Publications. ISBN 978-0-486-46624-8
Teichmüller–Tukey_lemma
Surname list
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Janes
American mathematician (1943–2020)
2 {\displaystyle \aleph _{2}} . The concept of a Jech–Kunen tree is named after him and Thomas Jech. The journal Topology and its Applications has dedicated
Kenneth_Kunen
Mathematician (1845–1918)
britannica.com Stanford Encyclopedia of Philosophy: Set theory by Thomas Jech. The Early Development of Set Theory by José Ferreirós. "Cantor infinities"
Georg_Cantor
Surname list
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Janc
Study of health and disease within a population
Journal of Epidemiology & Community Health. 56 (11): 808–812. doi:10.1136/jech.56.11.808. PMC 1732047. PMID 12388565. Mackey T, Baur C, Eysenbach G (14
Epidemiology
Surname list
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Ivanovski
Family name
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Jones_(surname)
Mathematical set that can be enumerated
3–4 Avelsgaard 1990, p. 180 Fletcher & Patty 1988, p. 187 Hrbacek, Karel; Jech, Thomas (22 June 1999). Introduction to Set Theory, Third Edition, Revised
Countable_set
Surname list
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Janicki
Sparta Prague 2012–13 football season
(UTC+1) Danoski 59' Mišůn 80' Hájovský 89' Report Stadium: Na Litavce Attendance: 5,682 Referee: Jiří Jech Assistant referees: Kryštof Mencl, Petr Blažej
2012–13 AC Sparta Prague season
2012–13_AC_Sparta_Prague_season
Name list
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Jayne
Interruption of cardiac blood supply
Journal of Epidemiology and Community Health. 55 (7): 475–82. doi:10.1136/jech.55.7.475. PMC 1731938. PMID 11413176. Bucholz EM, Ma S, Normand SL, Krumholz
Myocardial_infarction
Health study of British civil servants
Journal of Epidemiology and Community Health. 32 (4): 244–249. doi:10.1136/jech.32.4.244. PMC 1060958. PMID 744814. Marmot, M. G.; Davey Smith, G.; Stansfield
Whitehall_Study
Class of cardinal numbers
large cardinals. Hrbacek, Karel; Jech, Thomas (1999), Introduction to Set Theory (3 ed.), CRC Press, ISBN 0-8247-7915-0 Jech, Thomas (2003), Set Theory, Springer
Limit_cardinal
Slovan Liberec 2012–13 football season
Vácha 65' Kušnír 67' Report Mareš 22' Stadium: Stadion u Nisy Attendance: 3,270 Referee: Jiří Jech Assistant referees: Patrik Filípek, Michal Urban
2012–13 FC Slovan Liberec season
2012–13_FC_Slovan_Liberec_season
Surname list
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Jensen_(surname)
Surname list
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Ibáñez_(surname)
Cardiovascular cohort study
ERICA risk scores". J Epidemiol Community Health. 51 (5): 515–9. doi:10.1136/jech.51.5.515. PMC 1060537. PMID 9425461. Marshall NS, Wong KK, Phillips CL, Liu
Framingham_Heart_Study
Property that has been closed, seized, or restricted by authorities
preservation of a chronically sick building". Journal of Epidemiology & Community Health. 54 (7): 552–556. doi:10.1136/jech.54.7.552. PMC 1731714. PMID 10846199.
Condemned_property
Mathematical lemma
Georg Cantor Paul Cohen Richard Dedekind Abraham Fraenkel Kurt Gödel Thomas Jech John von Neumann Willard Quine Bertrand Russell Thoralf Skolem Ernst Zermelo
Rasiowa–Sikorski_lemma
Slavia Prague 2009–10 football season
23 August 2009 5 Teplice 1–1 Slavia Prague Teplice Stožický 17' Report J. Černý 41' Stadium: Na Stínadlech Attendance: 10,690 Referee: Jiří Jech
2009–10 SK Slavia Prague season
2009–10_SK_Slavia_Prague_season
Aspect of human growth
and Wales". Journal of Epidemiology and Community Health: jech–2025–225029. doi:10.1136/jech-2025-225029. ISSN 0143-005X. van der Eng, Pierre; Baten, Joerg;
Human_height
German logician and mathematician (1871–1953)
Georg Cantor Paul Cohen Richard Dedekind Abraham Fraenkel Kurt Gödel Thomas Jech John von Neumann Willard Quine Bertrand Russell Thoralf Skolem Ernst Zermelo
Ernst_Zermelo
Topics referred to by the same term
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Janković
2006 Czech film
Grandhotel Directed by David Ondříček Written by Pavel Jech Jaroslav Rudis Marek Epstein Produced by Krystof Mucha David Ondricek Starring Marek Taclík
Grandhotel
Surname list
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Ivanenko
Mathematical concept
Georg Cantor Paul Cohen Richard Dedekind Abraham Fraenkel Kurt Gödel Thomas Jech John von Neumann Willard Quine Bertrand Russell Thoralf Skolem Ernst Zermelo
Equivalence_class
Geographical region between Indus and Jhelum Rivers in Pakistan
James R (2001). Rivers of the World. ABC-CLIO. p. 122. ISBN 1-57607-042-5. jech doab. Dikshit, K. R.; Dikshit, Jutta K. (Feb 18, 2025). "6.2.4.1 Population
Sindh_Sagar_Doab
Smallest ordinal number that, considered as a set, is uncountable
Archived from the original on 2020-10-03. Retrieved 2020-08-12. Thomas Jech, Set Theory, 3rd millennium ed., 2003, Springer Monographs in Mathematics
First_uncountable_ordinal
Identities and relationships involving sets
Georg Cantor Paul Cohen Richard Dedekind Abraham Fraenkel Kurt Gödel Thomas Jech John von Neumann Willard Quine Bertrand Russell Thoralf Skolem Ernst Zermelo
Algebra_of_sets
Mathematical proposition equivalent to the axiom of choice
New York: Blaisdell. pp. 16–17. Jech 2008, ch. 2, §2 Some applications of the Axiom of Choice in mathematics Jech 2008, p. 9 William Timothy Gowers
Zorn's_lemma
Concept in mathematical logic
Silver cardinals, and zero sharp. Identity of indiscernibles Rough set Jech, Thomas (2003). Set Theory. Springer Monographs in Mathematics (Third Millennium ed
Indiscernibles
Name list
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Bevan
American politician
▌Kristen Thompson (R) ▌Lonnie Paxton (R) ▌Vacant ▌Brian Guthrie (R) ▌Darcy Jech (R) ▌Casey Murdock (R) ▌Grant Green (R) ▌Julie Daniels (R) ▌Julia Kirt (D)
Dusty_Deevers
Surname list
Janowicz Janowitz Janša Jansik Janů Januš Januszczak Janyk Janyska Janza Jašek Jech Jeníček Jeník Jenista Jonek Jończy/Jończa, Jonczyk Yankov Yankovsky Yanukovych
Janke
Desirable level of functional or metabolic efficiency of a living being
(PDF). Journal of Epidemiology & Community Health. 62 (4): e2. doi:10.1136/jech.2007.062414. PMID 18365329. S2CID 13859588. White, Mathew P.; Alcock, Ian;
Health
Intentional act causing one's own death
Journal of Epidemiology and Community Health. 61 (8): 731–6. doi:10.1136/jech.2006.052365. PMC 2653005. PMID 17630375. Gould MS, Wallenstein S, Davidson
Suicide
Partial order with well-ordered predecessors
Mathematical Logic. New York: Springer-Verlag. p. 517. ISBN 0-387-90170-1. Jech, Thomas (2002). Set Theory. Springer-Verlag. ISBN 3-540-44085-2. Kunen, Kenneth
Tree_(set_theory)
Set of the elements not in a given subset
Georg Cantor Paul Cohen Richard Dedekind Abraham Fraenkel Kurt Gödel Thomas Jech John von Neumann Willard Quine Bertrand Russell Thoralf Skolem Ernst Zermelo
Complement_(set_theory)
JECH
JECH
JECH
JECH
JECH
JECH
JECH
JECH
JECH