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