In the Media

Joseph J. Kohn ’53, “who played a key role in extending the mathematics of calculus,” has died at 91, reports Kenneth Chang for The New York Times. “Dr. Kohn studied how mathematical functions behave in the realm of complex numbers,” writes Chang. “This field is esoteric, even to many mathematicians. But the techniques that Dr. Kohn developed have found use in tackling a wide range of problems in mathematics as well as fundamental equations in physics, including Einstein’s theory of general relativity.”