Top Open Problems
Provisional editorial order for Top Open Problems: Millennium Prize Problems first, followed by assessed difficulty tiers; the unassessed remainder keeps its previous catalogue order. About rankings
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- Math-1951 Pingree open problems — Hochman problem 2
- Math-1952 Pingree open problems — Boyle problem 1
- Math-1953 Pingree open problems — Boyle problem 2
- Math-1954 Little shift equivalence conjecture
- Math-1955 Classify shifts of finite type
- Math-1956 Factor maps between sofic shifts
- Math-1957 Expansive directions of two-dimensional SFTs
- Math-1958 Commuting expansive automorphisms
- Math-1959 Commuting powers conjecture
- Math-1960 Furstenberg times-p-times-q problem
- Math-1961 Full-support invariant measures
- Math-1962 Invariant measures and subsystems
- Math-1963 Equal-entropy SFT covers
- Math-1964 Equal-entropy subcovers
- Math-1965 Stable cellular-automaton limit sets
- Math-1966 Extension of a block code II
- Math-1967 Embedding one-sided subshifts
- Math-1968 Classify one-sided sofic shifts
- Math-1969 Automorphism groups of full shifts
- Math-1970 Periodic points of cellular automata
- Math-1971 Jointly periodic points in one dimension
- Math-1972 Growth of jointly periodic points I
- Math-1973 Growth of jointly periodic points II
- Math-1974 Sparse jointly periodic points
- Math-1975 Periodic and finite configurations
- Math-1976 Surjunctive groups
- Math-1977 Adler's renewal question
- Math-1978 Classify sofic shifts
- Math-1979 Flow equivalence of subshifts
- Math-1980 Multiple ergodic averages — Problem 2
- Math-1981 Multiple ergodic averages — Problem 4
- Math-1982 Multiple ergodic averages — Problem 6
- Math-1983 Multiple ergodic averages — Problem 7
- Math-1984 Multiple ergodic averages — Problem 8
- Math-1985 Multiple ergodic averages — Problem 10
- Math-1986 Multiple ergodic averages — Problem 11
- Math-1987 Multiple ergodic averages — Problem 12
- Math-1988 Multiple ergodic averages — Problem 14
- Math-1989 Multiple ergodic averages — Problem 18
- Math-1990 Multiple ergodic averages — Problem 19
- Math-1991 Multiple ergodic averages — Problem 21
- Math-1992 Multiple ergodic averages — Problem 26
- Math-1993 Multiple ergodic averages — Problem 28
- Math-1994 Multiple ergodic averages — Problem 29
- Math-1995 Multiple ergodic averages — Problem 31
- Math-1996 Multiple ergodic averages — Problem 33
- Math-1997 Multiple ergodic averages — Problem 35
- Math-1998 Invariant line fields on Julia sets
- Math-1999 Density of hyperbolic rational maps
- Math-2000 Questions in Geometric Group Theory — Q 1.5