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  • ...proof of the lemma in 1934 to provide a more elegant proof of [[Schreier's Theorem]]. He was a doctorate student under Emil Artin at the time. In this artic * [[Schreier's Theorem]]
    2 KB (414 words) - 11:13, 9 April 2019
  • '''Theorem.''' Let <math>M</math> be a left <math>R</math>-module, for a ring <math>R< the [[well-ordering theorem]], a consequence of the [[axiom of choice]]),
    6 KB (1,183 words) - 14:02, 18 August 2009