Nelson Onuchic, Brazilian mathematician (Brodosqui, São Paulo State 12 March 1926 – São Carlos, São Paulo State 03 September 1999)

From Austrian descent

ACHIEVEMENTS

Authored 49 works

Obtained important findings about P spaces and uniform structures that earned him renown in international scientific community (1958-60)

Introduced new concepts in asymptotic equivalence

Generalized the concept of  exit point

Extended Waszewski topological method for differential equations with time-delay

Obtained an instability criterion more generalized that from Hale concept (1971)

EPONYMY

Hartman-Onuchic theorem (1963)

Hale-Onuchic asymptotic method (1964)   

See (in Portuguese)

http://www.athena.biblioteca.unesp.br/exlibris/bd/brc/33004137031P7/2006/badin_mg_me_rcla.pdf