Top network posts

• 25 There exists a regular language A such that for all languages B, A ∩ B is regular.
• 11 Maximum number of edges in a planar graph
• 10 Looking for method to generalize parity argument for Klein's Theorem (Happy Ending Problem)
• 10 An example of a problem which is difficult but is made easier when a diagram is drawn
• 10 How are large prime numbers found?
• 9 Does the given operation on pairs of primes always repeat?
• 6 Topology with only countable unions
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