Imp.¹: Importance (Low ✭, Medium ✭✭, High ✭✭✭, Outstanding ✭✭✭✭)

Rec.²: Recommended for undergraduates.

Note: Resolved problems from this section may be found in Solved problems.

- Subject
- Algebra (6)
- Analysis (5)
- Combinatorics (32)
- Geometry (27)
- Graph Theory (222)
- Algebraic G.T. (8)
- Basic G.T. (40)
- Connectivity (2)
- Cycles (19)
- Matchings (4)
- Minors (5)
- Paths (2)

- Coloring (67)
- Directed Graphs (25)
- Extremal G.T. (7)
- Graph Algorithms (3)
- Hypergraphs (5)
- Infinite Graphs (11)
- Probabilistic G.T. (3)
- Topological G.T. (18)

- Group Theory (5)
- Logic (11)
- Number Theory (47)
- Theoretical Comp. Sci. (13)
- Topology (35)
- Unsorted (2)

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