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Whitehead problem
the problem of whether an abelian group 𝐴 satisfying Ext¹(𝐴,ℤ)=0 is necessarily free, now known to be independent of ZFC
Pronunciation
/ˈwʌɪthɛd ˈprɒbləm/
/ˈhwaɪthɛd ˈprɑbləm/
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mathematical problem