David Hilbert gave his famous list of $23$ unsolved problems presented in Paris in $1900$. Most of the problems are fully/partially resolved, some are still open (RH etc) and some are impossible to prove. Now if some mathematician has to present a similar list for $21$st century, what unsolved problems will definitely added to that list? What are the candidates? Can anyone suggest a few such problems?
2026-04-02 19:14:35.1775157275
Is there a Hilbert's list for $21$st century?
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There already is at least one such list, compiled by Stephen Smale. See here