RARE International Congress of Mathematicians Medal Zurich 1932 From Arthur Sard

Scare medal, typically only found in museums. This belonged to professor Arthur Sard. Arthur Sard was an American mathematician known for Sard's Theorem, a fundamental result in differential topology and analysis stating that the set of critical values (the image of critical points) of a smooth function between manifolds is a "small" set, meaning it has Lebesgue measure zero. His work, particularly on critical values and linear approximation, proved crucial for understanding generic properties of functions and manifolds, establishing that "bad" points where derivatives fail to have full rank are rare.