| Pioneer | Journal where reappraisal appeared | Title | Link to article containing reappraisal | 
| Felix Klein | Mat. Stud. | "Klein vs Mehrtens: Restoring the reputation of a great modern" | 18b | 
| Felix Klein | Journal of Humanistic Mathematics | "What makes a theory of infinitesimals useful? A view by Klein and Fraenkel." | 18i | 
| Felix Klein | Antiquitates Math. | "Exploring Klein's contested modernism" | 23b | 
Felix Klein (1849 – 1925) was a multi-faceted mathematician of
impeccably modern credentials.
See also
Fermat
Leibniz
Euler
Cauchy
Riemann
Cantor
Skolem
Robinson
Nelson
Hrbacek
Kanovei
Infinitesimal topics
 More on infinitesimals
 
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