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Question in abstract algebra
In group theory, a branch of abstract algebra, the Whitehead problem is the following question: Is every abelian group A with Ext1(A, Z) = 0 a free abelian
Whitehead_problem
British mathematician (1904–1960)
connection with algebraic K-theory. The Whitehead product is an operation in homotopy theory. The Whitehead problem on abelian groups was solved (as an independence
J._H._C._Whitehead
Yes-or-no question that cannot ever be solved by a computer
generalized by Rice's theorem. In 1973, Saharon Shelah showed the Whitehead problem in group theory is undecidable, in the first sense of the term, in
Undecidable_problem
Whitehead's algorithm is a mathematical algorithm in group theory for solving the automorphic equivalence problem in the finite rank free group Fn. The
Whitehead's_algorithm
Commutative group (mathematics)
the Whitehead problem: are all Whitehead groups of infinite order also free abelian groups? In the 1970s, Saharon Shelah proved that the Whitehead problem
Abelian_group
Combinatorial principle
Shelah showed that the diamond principle solves the Whitehead problem by implying that every Whitehead group is free. List of statements independent of ZFC
Diamond_principle
Limitative results in mathematical logic
hypothesis cannot be proved from ZFC. Shelah (1974) showed that the Whitehead problem in group theory is undecidable, in the first sense of the term, in
Gödel's incompleteness theorems
Gödel's_incompleteness_theorems
English mathematician and philosopher (1861–1947)
Alfred North Whitehead (15 February 1861 – 30 December 1947) was an English mathematician and philosopher. He created the philosophical school known as
Alfred_North_Whitehead
Anti-surface ship torpedo
Whitehead torpedo was the first self-propelled or "locomotive" torpedo ever developed. It was perfected in 1866 by British engineer Robert Whitehead from
Whitehead_torpedo
question of H. Friedman. In 1973, Saharon Shelah showed that the Whitehead problem ("is every abelian group A with Ext1(A, Z) = 0 a free abelian group
List of statements independent of ZFC
List_of_statements_independent_of_ZFC
Topics referred to by the same term
Whitehead group in mathematics may mean: A group W with Ext(W, Z)=0; see Whitehead problem For a ring, the Whitehead group Wh(A) of a ring A, equal to
Whitehead_group
In mathematics, a module that has a basis
A famous example is the Whitehead problem, which asks whether a Whitehead group is free or not. As it turns out, the problem is independent of ZFC. Given
Free_module
Israeli mathematician
group for which every proper subgroup is countable. He showed that Whitehead's problem is independent of ZFC. He gave the first primitive recursive upper
Saharon_Shelah
Standard system of axiomatic set theory
statements independent of ZFC. These include the continuum hypothesis, the Whitehead problem, and the normal Moore space conjecture. Some of these conjectures
Zermelo–Fraenkel_set_theory
Philosophical concept
In the philosophy of mind, the hard problem of consciousness (or simply the hard problem) is to explain how and why organisms have qualia, phenomenal consciousness
Hard_problem_of_consciousness
Information which one can express but not use
effective problem-solving in realistic situations. The phenomenon of inert knowledge was first described in 1929 by Alfred North Whitehead: "[T]heoretical
Inert_knowledge
19/20th-century German-American aviator
Gustave Albin Whitehead (born Gustav Albin Weisskopf; 1 January 1874 – 10 October 1927) was a German–American aviation pioneer. Between 1897 and 1915
Gustave_Whitehead
Australian video game programmer
Christian Whitehead, also known as The Taxman, is an Australian video game programmer and designer. He is most recognized for his work creating updated
Christian_Whitehead
Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer
List of unsolved problems in mathematics
List_of_unsolved_problems_in_mathematics
View that mind is a ubiquitous feature of reality
and, more controversially, to Thales, Plato, Schopenhauer, Alfred North Whitehead, and Bertrand Russell. Views described as panpsychism were advocated by
Panpsychism
Axiom in the mathematical field of set theory
MA + ¬CH implies that there exists a Whitehead group that is not free; Shelah used this to show that the Whitehead problem is independent of ZFC. Martin's
Martin's_axiom
Homological algebra is the study of homological functors
cohomology Galois cohomology Lie algebra cohomology Sheaf cohomology Whitehead problem Homological conjectures in commutative algebra This list page primarily
List of homological algebra topics
List_of_homological_algebra_topics
American gridiron football player (born 1992)
Rodney Darnell "Lucky" Whitehead Jr. (born June 2, 1992) is an American former professional football wide receiver and kick returner who played for three
Lucky_Whitehead
finite simple groups Herzog–Schönheim conjecture Subset sum problem Whitehead problem Word problem for groups Amenable group Capable group Commensurability
List_of_group_theory_topics
Problem in computer science
c2:HaltingProblem Alfred North Whitehead and Bertrand Russell, Principia Mathematica to *56, Cambridge at the University Press, 1962. Re: the problem of paradoxes
Halting_problem
English actor (born 1939)
Geoffrey Whitehead (born 1 October 1939) is an English actor. He has appeared in a range of television, film and radio roles. Whitehead was born on 1 October
Geoffrey_Whitehead
Open question in philosophy of how abstract minds interact with physical bodies
The mind–body problem is a philosophical problem concerning the relationship between thought and consciousness in the human mind and body. It addresses
Mind–body_problem
3-volume treatise on mathematics, 1910–1913
of mathematics written by the mathematician–philosophers Alfred North Whitehead and Bertrand Russell and published in 1910, 1912, and 1913. In 1925–1927
Principia_Mathematica
Intersection of Set Theory and General Topology
¬CH implies that there exists a Whitehead group that is not free; Shelah used this to show that the Whitehead problem is independent of ZFC. Forcing is
Set-theoretic_topology
Overview of claims to the first powered airplane flight
adopted a bill naming Gustave Whitehead as the first to fly, a claim he made in 1901, later challenged by profound problems of documentation and contradictory
Claims to the first airplane flight
Claims_to_the_first_airplane_flight
mathematics, the Kneser–Tits problem, introduced by Tits (1964) based on a suggestion by Martin Kneser, asks whether the Whitehead group W(G,K) of a semisimple
Kneser–Tits_conjecture
American poet
Ron Whitehead is an American poet, author and activist. Whitehead was born on a farm in Kentucky, but traveled to the University of Louisville and Oxford
Ron_Whitehead
Homotopy invariant of maps between n-spheres
contains 2 Z {\displaystyle 2\mathbb {Z} } . Moreover, the image of the Whitehead product of identity maps equals 2, i. e. h ( [ i n , i n ] ) = 2 {\displaystyle
Hopf_invariant
Unanswered question in the study of consciousness
binding problem is the problem of how objects, background, and abstract or emotional features are combined into a single experience. The binding problem refers
Binding_problem
Two interlinked loops with five structural crossings
In knot theory, the Whitehead link, named for J. H. C. Whitehead, is one of the most basic links. It can be drawn as an alternating link with five crossings
Whitehead_link
American novelist (1882-1932)
Henry St. Clair Whitehead (March 5, 1882 – November 23, 1932) was an American Episcopal minister and author of horror, some non fiction and fantasy fiction
Henry_S._Whitehead
English explorer and naturalist (1860–1899)
John Whitehead (30 June 1860 – 2 June 1899) was an English explorer, naturalist and professional collector of natural history specimens in Southeast Asia
John_Whitehead_(explorer)
Species of bird endemic to New Zealand
The whitehead (Mohoua albicilla; Māori: pōpokotea) is a species of small (15 cm in length, 18.5/14.5 g.) passerine bird endemic to New Zealand. It is
Whitehead_(bird)
German mathematician (1862–1943)
mathematics. His approach differed from the later "foundationalist" Russell–Whitehead or "encyclopedist" Nicolas Bourbaki, and from his contemporary Giuseppe
David_Hilbert
President of the United States (2017–2021; since 2025)
at Debate". The New York Times. Retrieved September 25, 2024. Perry, Whitehead & Grubbs 2021, p. 229, Christian nationalist ideology was among the strongest
Donald_Trump
treatment of the problem of evil written from the perspective of 'process' philosophical and theological thought." Griffin builds on Whitehead's view that God
Religious responses to the problem of evil
Religious_responses_to_the_problem_of_evil
Rhodesian politician (1905–1971)
Sir Edgar Cuthbert Fremantle Whitehead, KCMG OBE (8 February 1905 – 22 September 1971) was a Rhodesian politician and statesman who served as Prime Minister
Edgar_Whitehead
Determining whether a knot is the unknot
Unsolved problem in mathematics Can unknots be recognized in polynomial time? More unsolved problems in mathematics In mathematics, the unknotting problem is
Unknotting_problem
American escapologist and stuntman (1874–1926)
22, 1926, speculated that Houdini's death was caused by Jocelyn Gordon Whitehead, who repeatedly struck Houdini's abdomen. The accounts of the witnesses
Harry_Houdini
Greek philosopher
Christian, Jewish and Islamic philosophy. In modern times, Alfred North Whitehead said: "the safest general characterization of the European philosophical
Plato
Branch of philosophy
mind–body problem is a paradigmatic issue in philosophy of mind, although a number of other issues are addressed, such as the hard problem of consciousness
Philosophy_of_mind
Self-propelled underwater weapon
Fulton's use of the term to describe his stationary mines, and later Robert Whitehead's naming of the first self-propelled torpedo. Surface-skimming incendiary
Torpedo
1996 film by Arlene Sanford
led to the disappearance of Dr. Whitehead's son Gilligan and Carol's first husband, a professor. In Dr. Whitehead's words, "The Minnow is lost", and
A_Very_Brady_Sequel
HTTP extension for collaborative editing
began in 1996 when Jim Whitehead worked with the World Wide Web Consortium (W3C) to host two meetings to discuss the problem of distributed authoring
WebDAV
American basketball player (born 1984)
in basketball. His combination of speed and size often created matchup problems for opposing teams because James was capable of charging past larger defenders
LeBron_James
Whitehead conjecture (also known as the Whitehead asphericity conjecture) is a claim in algebraic topology. It was formulated by J. H. C. Whitehead in
Whitehead_conjecture
Multi-sport event
Archived from the original on 29 January 2024. Retrieved 29 January 2024. Whitehead, Jacob (22 March 2024). "The push for athletes to compete on drugs backed
Enhanced_Games
Mathematical concept
isomorphism problem. It is notable that this means that the isomorphism problem, orbit problems (in particular the conjugacy problem) and Whitehead's problem are
Hyperbolic_group
American documentary filmmaker (born 1949)
Martin Smith (born January 28, 1949) is an American producer, writer, director and correspondent. Smith has produced dozens of nationally broadcast documentaries
Martin_Smith_(documentarian)
American jazz saxophonist and composer (1930–2026)
Archived from the original on May 26, 2026. Retrieved May 27, 2026. Whitehead, Kevin; Terry Gross (May 29, 2026). "Remembering tenor saxophonist Sonny
Sonny_Rollins
Impossible task in computing
p. 3ff. Whitehead, Alfred North; Russell, Bertrand, Principia Mathematica to *56, Cambridge at the University Press, 1962. Re: the problem of paradoxes
Entscheidungsproblem
Rage comic character
Internet culture at its finest". The Next Web. Retrieved June 13, 2020. Whitehead, Thomas (March 4, 2015). "Copyright Owner of 'Trollface' Image Explains
Trollface
1956 computer program written by Allen Newell, Herbert A. Simon and Cliff Shaw
Logic Theorist proved 38 of the first 52 theorems in chapter two of Whitehead and Bertrand Russell's Principia Mathematica, and found new and shorter
Logic_Theorist
American black metal solo project
Leviathan is an American black metal solo project that started in 1998 by Jef Whitehead under the pseudonym Wrest. On all Leviathan albums, Wrest records all
Leviathan_(musical_project)
1969 film by Alan Rafkin
Henry Jones, Edgar Buchanan, and Gary Collins. The Reverend Samuel D. Whitehead, former Marine, bricklayer, and recent seminary graduate, is ecstatic
Angel_in_My_Pocket
English footballer
Dean Whitehead (born 12 January 1982) is an English football coach and former professional footballer who is Darrell Clarke's assistant manager at EFL
Dean_Whitehead
Political event in the United Kingdom
for the Door". The Guardian. ISSN 0261-3077. Retrieved 11 June 2026. Whitehead, Jamie; Smith, Alex. "Armed Forces Minister Al Carns Quits Hours After
2026 Labour Party leadership crisis
2026_Labour_Party_leadership_crisis
Theorem in geometric topology
way he believed his question would be answered. In the 1930s, J. H. C. Whitehead claimed a proof but then retracted it. In the process, he discovered some
Poincaré_conjecture
Fictional detective created by Agatha Christie
Roger Ackroyd was made by The Wireless Theatre Company and started Ben Whitehead as the voice of Hercule. In 2021 L.A. Theatre Works produced an adaptation
Hercule_Poirot
Portuguese footballer (born 1994)
male player to score in 5 World Cups". ESPN. Retrieved 24 November 2022. Whitehead, Jacob (28 November 2022). "Portugal vs Uruguay result: Fernandes double
Bruno_Fernandes
incompatibility (help) Whitehead, Henry (1924). Indian Problems in Religion, Education, Politics. Constable. Anderson, George; Whitehead, Henry (1932). Christian
Henry_Whitehead_(bishop)
American geneticist (1949–2016)
folding problem within a family of molecules known as heat-shock proteins, and prions. Lindquist was a member and former director of the Whitehead Institute
Susan_Lindquist
Tyrie Remain 42.7% South East England 49.4% 50.6% Southampton Test Alan Whitehead Remain 8.7% South East England 49.4% 50.6% South Antrim Danny Kinahan
Results of the 2016 United Kingdom European Union membership referendum by constituency
Results_of_the_2016_United_Kingdom_European_Union_membership_referendum_by_constituency
Retirement for Age February 15, 1939 2227 8050 Exemption of Robert F. Whitehead from Compulsory Retirement for Age February 15, 1939 2228 8051 Limiting
List of executive actions by Franklin D. Roosevelt
List_of_executive_actions_by_Franklin_D._Roosevelt
Most populous city in the United States
York City (4th ed.). New York: Crown Publishers. ISBN 978-0-8129-3107-5. Whitehead, Colson (2003). The Colossus of New York: A City in 13 Parts. Doubleday
New_York_City
Video game and media franchise
iOS and Android devices. After Australian programmer Christian "Taxman" Whitehead developed a version of Sonic CD for modern consoles in 2011, he collaborated
Sonic_the_Hedgehog
Forming something new and somehow valuable
Perspectives on Creativity. In 1927, mathematician and philosopher Alfred North Whitehead gave the Gifford Lectures at the University of Edinburgh, later published
Creativity
English actor (born 1977)
Retrieved 14 January 2016. McNary, Dave (23 March 2016). "Harry Styles, Fionn Whitehead to Star in Christopher Nolan WW2 Action-Thriller 'Dunkirk'". Variety.
Tom_Hardy
Group for scholarship on Alfred North Whitehead
The Whitehead Research Project (WRP) is dedicated to research and scholarship on the texts, philosophy, and life of mathematician and philosopher Alfred
Whitehead_Research_Project
Problem in game theory
Paise Restaurant Problem for extending it from binary choice (go to the bar or stay home) to multiple options for each player. Whitehead, Duncan (2008-09-17)
El_Farol_Bar_problem
Lecturer in the History of Maths at the Open University Vicky Neale, Whitehead Lecturer at the Mathematical Institute and Balliol College, Oxford 2 October
List of In Our Time programmes
List_of_In_Our_Time_programmes
Subfield of automated reasoning and mathematical logic
and Whitehead in their influential Principia Mathematica, first published 1910–1913, and with a revised second edition in 1927. Russell and Whitehead thought
Automated_theorem_proving
Interdisciplinary book series
Contemporary Whitehead Studies (CWS) is an interdisciplinary book series that publishes manuscripts from scholars with contemporary and innovative approaches
Contemporary Whitehead Studies
Contemporary_Whitehead_Studies
Philosophical study of being
(1889–1951) and inspired D. M. Armstrong's (1926–2014) ontology. Alfred North Whitehead (1861–1947), by contrast, developed a process ontology. Rudolf Carnap
Ontology
Largest species of toothed whale
ISBN 978-0-7006-1772-2. Zbl 0945.14001. Whitehead 2003, p. 343. Whitehead 2003, p. 122. Whitehead 2003, p. 123. Whitehead 2003, p. 185. Mammals in the Seas
Sperm_whale
Fictional character from Sherlock Holmes stories
Germany: Friedrich Perthes and I.H. Besser., as described in Teets, Donald; Whitehead, Karen (1999). "The Discovery of Ceres: How Gauss Became Famous". Mathematics
Professor_Moriarty
Metaphysical question
extension of logic, as philosophers such as Bertrand Russell and Alfred North Whitehead did, then mathematical structures like numbers and shapes must be necessarily
Why_is_there_anything_at_all?
original on 16 April 2014. Retrieved 22 April 2011. Mary Riddell; Tom Whitehead (18 July 2011). "Immigration should be frozen, says Miliband adviser"
List of British Jewish writers
List_of_British_Jewish_writers
War actions of the German military officer
2016. Benishay 2016. Cohen 2015. Shepherd 2016, p. 357. Elam, Shraga; Whitehead, Dennis (29 March 2007). "Rauff vs. the Yishuv". Haaretz Daily Newspaper
Erwin Rommel in the Second World War
Erwin_Rommel_in_the_Second_World_War
2010 video game
games of the seventh generation of video game consoles. Eurogamer's Dan Whitehead hoped the eighth generation of consoles would offer "similarly powerful
Red_Dead_Redemption
Prime knot named for John Horton Conway
2020.191.2.5. JSTOR 10.4007/annals.2020.191.2.5. Wolfson, John. "A math problem stumped experts for 50 years. This grad student from Maine solved it in
Conway_knot
Logical principle
principle was stated as a theorem of propositional logic by Russell and Whitehead in Principia Mathematica as: ✸2.1 ~p ∨ p From the late 1800s through the
Law_of_excluded_middle
Austrian–British philosopher of science (1902–1994)
of problem solving. Popper presents falsifiability as both an ideal and as an important principle in a practical method of effective human problem solving;
Karl_Popper
English football club season
Archived from the original on 4 November 2023. Retrieved 5 November 2023. Whitehead, Jacob (15 December 2023). "Why was Mikel Arteta not guilty? Explaining
2023–24_Arsenal_F.C._season
British racing driver (1914–1958)
Peter Nield Whitehead (12 November 1914 – 21 September 1958) was a British racing driver. He was born in Menston, Yorkshire and was killed in an accident
Peter Whitehead (racing driver)
Peter_Whitehead_(racing_driver)
Skin condition characterized by pimples
hair follicles. Typical features of the condition include blackheads or whiteheads, pimples, oily skin, and possible scarring. It primarily affects skin
Acne
Use of mathematics as a philosophical framework
7–78. doi:10.1017/CBO9780511805042.004. ISBN 978-0-521-24594-4. Whitehead, Whitehead, Alfred North and Bertrand Russell (1963). Principia Mathematica
Mathematicism
1960 article by Eugene Wigner
in describing nature. Albert Einstein and the philosopher Alfred North Whitehead had previously thought that the success of abstract mathematics in physical
The Unreasonable Effectiveness of Mathematics in the Natural Sciences
The_Unreasonable_Effectiveness_of_Mathematics_in_the_Natural_Sciences
prices: 'We had to apply market rates'". City AM. Retrieved May 7, 2026. Whitehead, Jacob; Harpur, Charlotte (June 16, 2026). "Which World Cup matches had
List of 2026 FIFA World Cup controversies
List_of_2026_FIFA_World_Cup_controversies
Lonnie White Mitch White Patrick White Randy White Russell White Willie Whitehead James Whitley Kevin Whitley Arthur Whittington J.R. Wilburn James Wilder
List of NFL players with chronic traumatic encephalopathy
List_of_NFL_players_with_chronic_traumatic_encephalopathy
Showerheads". Energy.gov. Retrieved 16 December 2020. Williams, Alison; Dunham Whitehead, Camilla; Lutz, James (February 2013). "A crosscutting review of plumbing
Low-flow_fixtures
Austro-Hungarian Navy officer
the problem of setting off explosive charges remotely below a ship's waterline, this being far more effective than above-water bombardment. Whitehead then
Giovanni_Luppis
British comedy TV series (1991–94)
and 3) – Faith's best friend who is unlucky in love. Richard (Geoffrey Whitehead) – Bill's boss at the magazine. Richard is married to Marjorie, but has
Second_Thoughts_(TV_series)
Basic distinction in philosophy
subjectivity and objectivity with a gray area in-between, or that the problem of other minds is best viewed through the concept of intersubjectivity
Subjectivity and objectivity (philosophy)
Subjectivity_and_objectivity_(philosophy)
2013 video game
Archived from the original on August 16, 2025. Retrieved January 10, 2026. Whitehead, Thomas (May 23, 2014). "Nintendo Confirms New 'Sea Green' 2DS Model"
Tomodachi_Life
WHITEHEAD PROBLEM
WHITEHEAD PROBLEM
Boy/Male
Hindu, Indian
Problem
Boy/Male
Arabic, Indian, Muslim
Problem Solver
Girl/Female
Indian, Telugu
Destroyer of Problems
Surname or Lastname
English
English : metonymic occupational name for a baker or seller of white bread, from Old English hwīt ‘white’ or hwǣte ‘wheat’ + brēad ‘bread’. White bread, considered the best bread, was made from wheat flour.In some cases, perhaps a translation of the German cognate Weisbrot.
Girl/Female
Bengali, Indian
Eternity; Problem Solver
Boy/Male
Muslim
Problem solver
Boy/Male
Indian, Tamil
People with this Name are Preferably Intelligent and Very Generous; Highly Knowledgeable in Problem Solving Skills
Girl/Female
Muslim/Islamic
Away from all Problems
Surname or Lastname
English and Scottish
English and Scottish : nickname for someone with fair or prematurely white hair, from Middle English whit ‘white’ + heved ‘head’.Irish (Connacht) : erroneous translation of Ó Ceanndubháin ‘descendant of the little black-headed one’ (see Canavan), as if from Gaelic ceann ‘head’ + bán ‘white’.Translated form of German Weisshaupt (see Weishaupt) or Weisskopf (see Weiskopf).
WHITEHEAD PROBLEM
WHITEHEAD PROBLEM
Boy/Male
Hindu
Lord Vishnu, Lord Krishna
Boy/Male
Hebrew American Irish Scottish English
Gift from God.
Boy/Male
Indian, Punjabi, Sikh
Victory of Good Company
Boy/Male
Tamil
Horizon
Biblical
shadow; the tingling of the ear
Boy/Male
Gaelic Irish
Red haired.
Girl/Female
Assamese, Gujarati, Hindu, Indian, Kannada, Marathi, Sindhi, Tamil, Telugu
Pure; Like a Pearl
Boy/Male
Gujarati, Hindu, Indian
Name of Lord Shiva
Boy/Male
Anglo Saxon
Bold friend.
Boy/Male
Hindu, Indian, Kannada, Telugu
Fear; Be Ready; Lord Shiva
WHITEHEAD PROBLEM
WHITEHEAD PROBLEM
WHITEHEAD PROBLEM
WHITEHEAD PROBLEM
WHITEHEAD PROBLEM
superl.
White mixed with black, as the color of pepper and salt, or of ashes, or of hair whitened by age; sometimes, a dark mixed color; as, the soft gray eye of a dove.
a.
Questionable; equivocal; indefinite; problematical.
n.
The blue-winged snow goose.
imp. & p. p.
of Whiten
n.
An old man; a graybeard.
n.
One who proposes problems.
a.
Whitened; make white.
n.
The whiteweed (Chrysanthemum Leucanthemum), the plant commonly called daisy in North America; -- called also oxeye daisy. See Whiteweed.
n.
A fatty, solid substance, produced by bees, and employed by them in the construction of their comb; -- usually called beeswax. It is first excreted, from a row of pouches along their sides, in the form of scales, which, being masticated and mixed with saliva, become whitened and tenacious. Its natural color is pale or dull yellow.
n.
The surf scoter.
n.
A perennial composite herb (Chrysanthemum Leucanthemum) with conspicuous white rays and a yellow disk, a common weed in grass lands and pastures; -- called also oxeye daisy.
a.
Alt. of Problematical
n.
A certain function relating to a system of forces and their points of application, -- first used by Clausius in the investigation of problems in molecular physics.
v. t.
To have just and adequate ideas of; to apprehended the meaning or intention of; to have knowledge of; to comprehend; to know; as, to understand a problem in Euclid; to understand a proposition or a declaration; the court understands the advocate or his argument; to understand the sacred oracles; to understand a nod or a wink.
v. t.
To propose problems.
n.
To cause to stick; to bring to a stand; to pose; to puzzle; as, to stick one with a hard problem.
n.
The common beam tree of England (Pyrus Aria); -- so called from the white, woolly under surface of the leaves.
a.
Having the nature of a problem; not shown in fact; questionable; uncertain; unsettled; doubtful.
n.
A problem of more than usual difficulty added to another on an examination paper.
v. i.
To become white or whiter; to be whitened or blanched by excluding the light of the sun, as, plants.