Gonzalo Zubieta Russi, Mexican mathematician and logician (Ciudad del Carmen, Campeche State 26 May 1924 – 09 April 2021)

His thesis Sobre el calculo funcional de primer orden (1950) received comments by R. Feys in journal of Symbolic Logic

Introduced the notion of relative correspondence

Clases aritméticas definidas sin igualdad. Bol. Soc. Mat. Mex. 2:45-53, 1957

Proposed a version of standard analysis employing ultra-products and ultra-powers

Developed a logical method of analysis

Taller de Logica Matematica (Analisis Logico) 1993

OTHER CONTRIBUTIONS

Differential notation for set functions. Anales Inst. Mat. (1961)

Integrales de medida positiva (1976) monography

Clear definitions and free mathematical demonstrations of tautologies; a deductive methodology. j. math. 3(1), 2017

His brother, Francisco Zubieta Russi, mathematician (Jonuta, Tabasco State 23 November 1910 – 28 March 2005)

With G. Birkhoff & R. Vazquez obtained the first continuous homogeneous linear

Sobre una noción normal de la teoria de las clases. Mathesis 9(4):447-50, 1993

Una definición del orden natural de los numeros