Mahlon Marsh Day
| Mahlon Marsh Day | |
|---|---|
| Born | November 24, 1913 | 
| Died | 1992 (aged 78–79) | 
| Nationality | American | 
| Alma mater | Brown University | 
| Scientific career | |
| Fields | Mathematics | 
| Institutions | University of Illinois Urbana-Champaign (1940-1983) | 
| Thesis | Regularity of Function-to-function Transformations, Operations in Banach Spaces (1939) | 
| Doctoral advisor | Clarence Raymond Adams | 
Mahlon Marsh Day (1913–1992) was an American mathematician, who specialized in functional analysis, geometry of linear spaces and amenable semigroups.