The 24th Problem
Hilbert originally included 24 problems on his list, but decided against including one of them in the published list. The "24th problem" (in proof theory, on a criterion for simplicity and general methods) was rediscovered in Hilbert's original manuscript notes by German historian Rüdiger Thiele in 2000.
Read more about this topic: Hilbert's Problems
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“... your problem is your role models were models.”
—Jane Wagner (b. 1935)