Resolved year places a conjecture's proof in the year it actually appeared. Wikipedia notes that "in papers posted to the arXiv repository in 2002 and 2003, Perelman presented his work proving the Poincare conjecture," nearly a century after Poincare first posed it. Browsing by resolved year shows how long a hard problem can remain open before it finally falls.
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Era Of Emergence 1963
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1. Mathematical Logic (Wikipedia)
Wikimedia FoundationHistory sectionQuote, History section
Mathematical logic emerged in the mid-19th century as a subfield of mathematics, reflecting the confluence of two traditions: formal philosophical logic and mathematics.
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