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 (still a conjecture) or Fermat's Last Theorem (a conjecture until proven in ...
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open problems 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 engineering
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Unsolved problems in geoscience
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Unsolved problems in medicine
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Unsolved problems in neuroscience
There are yet unsolved problems in neuroscience, although some of these problems have evidence supporting a hypothesized solution, and the field is rapidly evolving. One major problem is even enumerating what would belong on a list such as this. ...
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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 phenomenon ...
Mathematics, philosophy 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
There are many longstanding unsolved problems in mathematics for which a solution has still not yet been found. The notable unsolved problems in statistics are generally of a different flavor; according to John Tukey, "difficulties in identifying ...
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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 philosophy
This is a list of some of the major problems in philosophy.
Metaphilosophy
Philosophical progress
A prominent question in metaphilosophy is that of whether or not philosophical progress occurs and more so, whether such progress in philosop ...
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Unsolved problems in information theory
Social sciences and languages
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Unsolved problems in economics
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Unsolved problems in fair division
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Unsolved problems in linguistics
This article discusses notable unsolved problems in linguistics.
Some of the issues below are commonly recognized as unsolved problems; i.e., it is generally agreed that no solution is known. Others may be described as controversies; i.e., alt ...
See also
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Cold case
A cold case is a crime, or a suspected crime, that has not yet been fully resolved and is not the subject of a current criminal investigation, but for which new information could emerge from new witness testimony, re-examined archives, new or re ...
(unsolved crimes)
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List of ciphertexts
Some famous ciphertexts (or cryptograms), in chronological order by date, are:
See also
* Undeciphered writing systems (cleartext, natural-language writing of unknown meaning)
External links
* Elonka Dunin
Elonka Dunin (; born December ...
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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 hundreds 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 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 versions of:
* Amazons
* Atomix
* Checkers
* Dyson Telesc ...
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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 undecidable problems
In computability theory, an undecidable problem is a type of computational problem that requires a yes/no answer, but where there cannot possibly be any computer program that always gives the correct answer; that is, any possible program would some ...
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List of unsolved deaths
This list of unsolved deaths includes well-known cases where:
* The cause of death could not be officially determined.
* The person's identity could not be established after they were found dead.
* The cause is known, but the manner of death (homi ...
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Lists of problems
The following articles contain lists of problems:
* List of undecidable problems
*Lists of unsolved problems
*List of NP-complete problems
This is a list of some of the more commonly known problems that are NP-complete when expressed as decisi ...
{{DEFAULTSORT:Unsolved problems
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Science-related lists
Lists of problems
Engineering