Mischa Cotlar, Ukrainian-born Argentine mathematician (Sarny, Rivne Oblast Province 01 August 1913 – Buenos Aires 16 January 2007)

His father, Ovsey Cotlar (1879-1952) is rembered in Lasker-Cotlar variant (chess)   

ACHIEVEMENTS

Enunciated the transfer principle in modern ergodic theory and ergodic Hilbert transform (1955)

Introduced the notion of quasi-orthogonality

Introduced quasi-orthogonal lemma for self-adjoint operators known as Cotlar-Stein lemma (1955)

With C. Sadosky introduced the concept of generalized Toeplitz kernels (1979) and the notion of algebraic scattering systems (1987)

Introduced the notion of “total” 

EPONYMY

Cotlar theorem

Cotlar-Sadosky lifting theorem (1979)

Cotlar-Sadosky extension theorem

Cotlar-Sadosky algebraic scattering systems

Cotlar inequalities

Toeplitz-Krein-Cotlar triplets

Cotlar decomposition

LINKS

http://www.emis.de/journals/BAMV/conten/vol1/vol1N1p75-83.pdf (in Spanish; contains bibliography)