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||Pages in this category should be moved to subcategories where applicable.
This category may require frequent maintenance to avoid becoming too large. It should directly contain very few, if any, articles and should mainly contain subcategories.
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This category has the following 16 subcategories, out of 16 total.
- ► Borderline life (3 C, 18 P)
- ► Unsolved crimes (7 C, 25 P)
- ► Unsolved deaths (1 C, 101 P)
- ► Economic puzzles (15 P)
- ► Hypotheses (15 C, 58 P)
- ► Inscriptions of disputed origin (2 C, 15 P)
- ► Unsolved problems in linguistics (5 C, 5 P)
- ► Philosophical problems (5 C, 40 P)
- ► Works of unknown authorship (3 C, 62 P)
- ► Year of work unknown (1 C, 8 P)
Pages in category "Open problems"
The following 19 pages are in this category, out of 19 total. This list may not reflect recent changes (learn more).