Leonida Tonelli
| Leonida Tonelli | |
|---|---|
| Born | 19 April 1885 Gallipoli, Apulia, Italy | 
| Died | 12 March 1946 (aged 60) Pisa, Italy | 
| Nationality | Italian | 
| Alma mater | University of Bologna | 
| Known for | Tonelli's theorem Tonelli's theorem (functional analysis) Tonelli–Hobson test | 
| Scientific career | |
| Fields | Mathematics | 
| Institutions | University of Cagliari University of Parma University of Bologna University of Pisa Scuola Normale Superiore | 
| Doctoral advisor | Cesare Arzelà | 
| Doctoral students | Emilio Baiada Paolo Budinich Lamberto Cesari Guido Stampacchia | 
Leonida Tonelli (19 April 1885 – 12 March 1946) was an Italian mathematician, noted for proving Tonelli's theorem, a variation of Fubini's theorem, and for introducing semicontinuity methods as a common tool for the direct method in the calculus of variations.