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This category has the following 16 subcategories, out of 16 total.
- ► Unsolved crimes (7 C, 8 P)
- ► Unsolved deaths (2 C, 141 P)
- ► Economic puzzles (18 P)
- ► Hypotheses (12 C, 64 P)
- ► Inscriptions of disputed origin (2 C, 15 P)
- ► Unsolved problems in linguistics (5 C, 6 P)
- ► Philosophical problems (6 C, 37 P)
- ► Quantum computing (1 C, 31 P)
- ► Works of unknown authorship (5 C, 149 P)
- ► Year of work unknown (1 C)
Pages in category "Open problems"
The following 20 pages are in this category, out of 20 total. This list may not reflect recent changes (learn more).