Rec.²: Recommended for undergraduates.

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

- Subject
- Algebra (7)
- Analysis (5)
- Combinatorics (36)
- Geometry (29)
- Graph Theory (226)
- Algebraic G.T. (8)
- Basic G.T. (39)
- Coloring (66)
- Directed Graphs (26)
- Extremal G.T. (8)
- Graph Algorithms (3)
- Hypergraphs (5)
- Infinite Graphs (11)
- Probabilistic G.T. (3)
- Topological G.T. (18)

- Group Theory (5)
- Logic (10)
- Number Theory (48)
- Theoretical Comp. Sci. (13)
- Topology (39)
- Unsorted (1)

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