Category:Open problems

• Lists of unsolved problems (9 P)
• Year of death unknown (1 C, 3,588 P)

C

• Undeciphered historical codes and ciphers (1 C, 12 P)
• Unsolved crimes (1 C, 3 P)

D

• Date of birth unknown (547 P)
• Date of death unknown (341 P)
• Unexplained disappearances (2 C, 10 P)

E

• Economic puzzles (14 P)

H

• Hypotheses (5 C, 49 P)

I

• Inscriptions of disputed origin (1 C, 11 P)

L

• Unsolved problems in linguistics (4 C, 4 P)

P

• Unidentified people (1 C, 55 P)
• Philosophical problems (30 P)
• Place of birth unknown (435 P)
• Place of death unknown (225 P)

S

• Year of song unknown (502 P)

U

• Unsolved problems in mathematics (3 C, 48 P)

W

• Works of unknown authorship (3 C, 149 P)

Y

• Year of birth unknown (1 C, 13,600 P)
• Year of establishment unknown (1 C, 6 P)

• Open problem

*

• Lists of unsolved problems

A

• Almáttki áss

B

• Binding problem

C

• Controversies in autism

G

• Great Filter

H

• Hard problem of consciousness

P

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

Q

• Quantum computing

S

• Space colonization

T

• Terraforming