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A compactness theorem for singular cardinals, free algebras, Whitehead problem and transversals. (English) Zbl 0369.02034

##### MSC:
 03C60 Model-theoretic algebra 03E35 Consistency and independence results 03C75 Other infinitary logic 03E99 Set theory 20A10 Metamathematical considerations in group theory 05A05 Permutations, words, matrices
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##### References:
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