### Biography

Carlos Graef Fernandez,** **Mexican mathematician and physicist (Guanaceví, Durango State 25 February 1911 – Ciudad de Mexico 13 January 1988)

From German descent

Authored 17 papers

Performed important works about gravitation

His doctoral thesis in Massachusetts Institute of Technology (MIT) about periodic paths of cosmic rays gained international level (1935)

Demonstrated that there is a number of possible motions in the plane of magnetic equator of Earth

Obtained simple mathematical formulas to describe equatorial periodic orbits

First to treat a problem of differential equations in three dimensions (1940)

Gave an explanation about curvature of luminous rays and the red shift to spectral rays

Solved the problem of two-body in gravitational theory

### HONORS

National Science Prize, American Mathematical Society (1970)