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

Rec.²: Recommended for undergraduates.

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

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- Probabilistic G.T. (3)
- Topological G.T. (18)

- Group Theory (5)
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- Theoretical Comp. Sci. (13)
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