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Describing free groups, Part II: $Π^{0}_{4}$ hardness and no $Σ_{2}^{0}$ basis
McCoy, Charles, Wallbaum, JohnVolume:
364
Language:
english
Journal:
Transactions of the American Mathematical Society
DOI:
10.1090/S0002-9947-2012-05458-4
Date:
November, 2012
File:
PDF, 136 KB
english, 2012