Kuratowski's Lemma/Historical Note

Historical Note on Kuratowski's Lemma

Kazimierz Kuratowski published what is now known as Kuratowski's Lemma in $1922$, thinking it little more than a corollary of Hausdorff's Maximal Principle.

In $1935$, Max August Zorn published his own equivalent, now known as Zorn's Lemma, acknowledging Kuratowski's earlier work.

This later version became the more famous one.


Sources

  • 1922: Kazimierz Kuratowski: Une méthode d'élimination des nombres transfinis des raisonnements mathématiques (Fund. Math. Vol. 3: pp. 76 – 108)
  • 1935: Max August Zorn‎: A remark on method in transfinite algebra (Bull. Amer. Math. Soc. Vol. 41: pp. 667 – 670)
  • 1964: Steven A. Gaal: Point Set Topology ... (previous) ... (next): Introduction to Set Theory: Notes
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