Category:Open problems

• Lists of unsolved problems (16 P)
• Year of death unknown (1 C, 8,745 P)

B

• Bridge disasters of unknown cause (4 P)

C

• Undeciphered historical codes and ciphers (1 C, 19 P)
• Unsolved crimes (6 C, 3 P)

D

• Unsolved deaths (23 C, 89 P)
• Unexplained disappearances (8 C, 21 P)

E

• Economic puzzles (17 P)

G

• Globsters (13 P)

H

• Hypotheses (14 C, 95 P)

I

• Inscriptions of disputed origin (2 C, 22 P)

L

• Unsolved problems in linguistics (6 C, 10 P)
• Lost inventions (1 C, 16 P)
• Lost places (5 C, 6 P)

P

• Unidentified people (12 C, 138 P)
• Philosophical problems (5 C, 42 P)

S

• Scientific problems (8 C, 4 P)
• Year of song unknown (816 P)

U

• Unexplained phenomena (6 C, 34 P)
• Unsolved problems in mathematics (6 C, 78 P)

W

• Works of unknown authorship (10 C, 245 P)

• Open problem

*

• Lists of unsolved problems

A

• Almáttki áss

B

• Binding problem

C

• Certificate revocation
• Controversies in autism

D

• Desert kite

E

• Erdstall
• Explanatory gap

F

• Four Corners Methane Hot Spot

G

• Glossary of quantum computing
• Great Filter

H

• Hard problem of consciousness

L

• List of works similar to the 2020 Utah monolith

O

• Overlapping markup

P

• Philosophy of artificial intelligence
• Potential applications of carbon nanotubes
• Problem of mental causation
• Publius Enigma

Q

• Quantum computing

S

• Schuylkill notes
• Space colonization

T

• Terraforming

V

• Vertiginous question