# Georges Glaeser

Georges Glaeser (* 1918 ; † 2002 ) was a French mathematician who dealt with analysis and mathematics didactics . He was director of the IREM (Institut de recherche sur l'enseignement des mathématiques) at the University of Strasbourg .

His father was the lawyer Léo Glaeser , originally from Riga , who was shot dead by the French militia in Rillieux-la-Pape with six other Jews on June 19, 1944 in retaliation for the murder of a Vichy state secretary by the Resistance. His brother is the film director Henri Glaeser (1929–2007).

Glaeser received his doctorate in 1957 from the University of Nancy under Laurent Schwartz ( Etude de certaines algebres Tayloriennes ).

He is known for Glaeser's theorem on continuity properties of the root function . Is of the class in an open set U of then is then exactly properly, when the first and second derivative to the zeros disappear f. ${\ displaystyle f \: \ U \ rightarrow \ mathbb {R} ^ {+}}$${\ displaystyle C ^ {2}}$${\ displaystyle \ mathbb {R} ^ {n}}$${\ displaystyle {\ sqrt {f}}}$${\ displaystyle C ^ {1}}$

He is also known for Glaeser's composition theorem, which specifies the conditions when a smooth function is the combination of two other smooth functions. It generalizes the main theorem of symmetric polynomials .

## Fonts

• Mathematiques pour l'eleve professeur. Hermann, Paris 1971.
• German translation by Ursula Drouillon: Mathematics for teachers in training and practice. Vieweg 1981.