List of unsolved problems may refer to several notable
conjectures
In mathematics, a conjecture is a conclusion or a proposition that is proffered on a tentative basis without proof. Some conjectures, such as the Riemann hypothesis or Fermat's conjecture (now a theorem, proven in 1995 by Andrew Wiles), hav ...
or
open problem
In science and mathematics, an open problem or an open question is a known problem which can be accurately stated, and which is assumed to have an objective and verifiable solution, but which has not yet been solved (i.e., no solution for it is kno ...
s in various academic fields:
Natural sciences, engineering and medicine
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Unsolved problems in astronomy
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Unsolved problems in biology
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Unsolved problems in chemistry
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Unsolved problems in geoscience
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Unsolved problems in medicine
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Unsolved problems in neuroscience
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Unsolved problems in physics
The following is a list of notable unsolved problems grouped into broad areas of physics.
Some of the major unsolved problems in physics are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomeno ...
Mathematics, statistics and information sciences
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Unsolved problems in mathematics
Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Eucli ...
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Unsolved problems in statistics
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Unsolved problems in computer science
This article is a list of notable unsolved problems in computer science. A problem in computer science is considered unsolved when no solution is known or when experts in the field disagree about proposed solutions.
Computational complexity
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Unsolved problems in information theory
Social sciences and humanities
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Problems in philosophy
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Unsolved problems in economics
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Unsolved problems in fair division
See also
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Cold case
''Cold Case'' is an American police procedural crime drama television series. It ran on CBS from September 28, 2003, to May 2, 2010. The series revolved around a fictionalized Philadelphia Police Department division that specializes in invest ...
(unsolved crimes)
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List of ciphertexts
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List of hypothetical technologies
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List of NP-complete problems
This is a list of some of the more commonly known problems that are NP-complete when expressed as decision problems. As there are thousands of such problems known, this list is in no way comprehensive. Many problems of this type can be found in ...
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List of paradoxes
This list includes well known paradoxes, grouped thematically. The grouping is approximate, as paradoxes may fit into more than one category. This list collects only scenarios that have been called a paradox by at least one source and have their ...
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List of PSPACE-complete problems
Here are some of the more commonly known problems that are PSPACE-complete when expressed as decision problems. This list is in no way comprehensive.
Games and puzzles
Generalized game, Generalized versions of:
* Amazons (game), Amazons
* At ...
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List of undecidable problems
In computability theory, an undecidable problem is a decision problem for which an effective method (algorithm) to derive the correct answer does not exist. More formally, an undecidable problem is a problem whose language is not a recursive set; ...
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List of unsolved deaths
This list of unsolved deaths includes notable cases where:
* The cause of death could not be officially determined following an investigation
* The person's identity could not be established after they were found dead
* The cause is known, but th ...
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Lists of problems
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Unknowability
{{DEFAULTSORT:Unsolved problems
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Science-related lists
Lists of problems
Engineering