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This list is a composite of notable unsolved problems mentioned in previously published lists, including but not limited to lists considered authoritative, and the problems listed here vary widely in both difficulty and importance.
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The 2025 World Seniors Championship (officially the 2025 JenningsBet World Seniors Championship) was a snooker tournament that took place from 7 to 11 May 2025 at the Crucible Theatre in Sheffield, England, the seventh consecutive year that the tournament was held at the venue.
The capacitor plague was a problem related to a higher-than-expected failure rate of non-solid aluminium electrolytic capacitors between 1999 and 2007, especially those from some Taiwanese manufacturers, [1][2] due to faulty electrolyte composition that caused corrosion accompanied by gas generation; this often resulted in rupturing of the case ...
Pelosi was a presidential elector for the state of California in the 2016 United States presidential election. Every presidential election year, the 538 members of the electoral college meet in their state capitals on December 19 to cast the official vote for president. She helped lead the effort to inform the electors and the public about foreign interference in elections. [11]
Besides the above frequency-based problems, some other types of problems have also been studied. Many graph problems are solved in the setting where the adjacency matrix or the adjacency list of the graph is streamed in some unknown order.
See Waring's problem and the related Waring–Goldbach problem on sums of powers of primes. Hardy and Littlewood listed as their Conjecture I: "Every large odd number (n > 5) is the sum of a prime and the double of a prime". [31] This conjecture is known as Lemoine's conjecture and is also called Levy's conjecture.