Category:Open problems

• Lists of unsolved problems‎ (16 P)
• Year of death unknown‎ (1 C, 8,563 P)

B

• Bridge disasters of unknown cause‎ (4 P)

C

• Undeciphered historical codes and ciphers‎ (1 C, 19 P)
• Unsolved crimes‎ (6 C, 2 P)

D

• Unsolved deaths‎ (19 C, 90 P)
• Unexplained disappearances‎ (8 C, 20 P)

E

• Economic puzzles‎ (17 P)

H

• Hypotheses‎ (15 C, 93 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 (4 C, 5 P)

P

• Unidentified people‎ (12 C, 141 P)
• Philosophical problems‎ (5 C, 40 P)

S

• Scientific problems‎ (8 C, 4 P)
• Year of song unknown‎ (817 P)

U

• Unsolved problems in mathematics‎ (6 C, 77 P)

W

• Works of unknown authorship‎ (9 C, 242 P)

• Open problem

*

• Lists of unsolved problems

A

• Almáttki áss

C

• Certificate revocation
• Controversies in autism

D

• Desert kite

E

• Erdstall

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

Q

• Quantum computing

S

• Schuylkill notes
• Space colonization

T

• Terraforming

V

• Vertiginous question