José Adem Chahin, Mexican mathematician (Tuxpan, Veracruz State 27 October 1921 – Ciudad de Mexico 14 February 1991)

Son of Lebanese immigrants

Developed formulae about Steenrod algebras worldwide known

With S. Gitler & Y.K. Lam defined secondary operations

Performed important contributions to immersion problem

An elementary solution of a problem of anisotropic elasticity (1949)

Adem relations, Adem formula, Adem extension theorem, Adem phenomenon, Adem cohomology operations, Adem cocyclic operations, Adem-Cartan álgebras & Adem-Cartan operads

The iteration of the Steenrod squares in algebraic topology. Proceed. Nat. Acad. Sciences USA 38:720-6, 1952

Relations on iterated reduced powers. Proceed. Natl. Acad. Sciences USA 39:636-8, 1953

Adem-Gitler theorems; Adem-Gitler operations

With S. Gitler. Secondary characteristics classes and the immersion problem. Bol. Soc. Mat. Mexicana 8:53-78, 1963

With S. Gitler. Non-immersion theorems for real projective Spaces. Bol. Soc. Mat. Mexicana 2(9):37-50, 1964

With S. Gitler & M. Mahowald. Embedding and immersion of projective Spaces. Bol. Soc. Mat. Mex. 10:84-8, 1965

Adem-Lam construction of normed and non-singular bilinear maps

On nonsingular bilinear maps. Bol. Soc. Mat. Mex. 16:64-70, 1971

Some immersions associated with bilinear maps. Bol. Soc.Mat. Mex. 13:95-104, 1968

Construction of some normed maps. Bol. Soc.Mat. Mex. 20:59-75, 1975

His brother, Julián Adem Chahín, mathematician and geophysicist (Tuxpan, Veracruz State 08 Janeiro 1924 –  Ciudad de Mexico 09 September 2015)

Authored over 136 works

It is said to be first correct physical explanation for the northwestward motion of tropical cyclones in the Northern Hemisphere

Series solution for the barotropic vorticity equation and its application in the study of atmospheric vortices. Tellus 8:364-72, 1956

Relevant works about hurricanes

On the relation between pressure and wind, with particular reference to a vortex. Tellus 10(3):326-30, 1958

With P. Lezama. On the motion of a Cyclone embedded in a uniform flow. Tellus 12(3):255-8, 1960

Presented a simplified model of the atmosphere (energy balance model) containing the coupling between dynamical and thermodynamical processes (Adem model for energy balance)

On the theory of the general circulation of the atmosphere. Tellus 14(1):102-15, 1962

First to establish a physical-mathematical method for seasonal tropospheric temperature prediction based on ocean thermal energy storage

Preliminary computations on the maintenance and prediction of seasonal temperatures in the troposphere (1963)

Developed a thermodynamic climate model for climate prediction known as Adem model

On the normal state of the troposphere-ocean continent system in the Northern Hemisphere. Geofis. Intern. 4:3-32, 1964

Hemispheric Thermodynamic Climate Model or Adem model

Developed a thermodynamic model for long-term Weather forecasting (before 1968) being the first physical model to be applied to study the effect of the variation of the Earth’s orbit on climate

First to be Applied to quantitatively verify that the continental drift produced the last terrestrial Ice Age

Descripción general del modelo termodinâmico. Variables, parâmetros y interacciones (1974)

Numerical-thermodynamic prediction of mean-monthly ocean temperatures. Tellus 27:541-51, 1975

A parametric method for computing the mean water budget of the atmosphere. Tellus 20(4):621-32, 1968

With E.E. Villanueva & V.M. Mendoza. A new method to estimate the seasonal cycle of the heat balance at the ocean surface, with special application to the Gulf of Mexico. Geofis. Internat. 32:21-4, 1993

With V.L. Barradas. Albedo model for a tropical dry deciduous forest in western Mexico. Intern. J. Biomet. 36:113-7, 1992

With Y.N. Skiba. A balanced and absolutely stable numerical thermodynamic model for closed and open oceanic basins. Geofís. Intern. 34(4):385-93, 1995

With V.M. Mendoza & B. Oda. An improved parametrization of the mean Monthly precipitation in Northern Hemisphere (2001)

Introduced a matrix-type of boundary value problem

With M. Moshinsky. Self-adjointness of a certain type of vectorial boundary value problems (1950)

First to demonstrate that the fundamental equation that rules the propagation of elastic waves in circular bars has complex roots

On the axially-symmetric steady wave propagation in elastic circular rods. Quart. J. Appl. Math. (1953)