Marshall Stone, the mathematician who helped develop the "new math," has died of a stroke, the University of Massachusetts announced Wednesday.

Stone, 85, a member of the National Academy of Sciences for 50 years and recipient of the National Medal of Science, the nation's highest scientific honor, died Monday in Madras, India, the Amhert, Mass., university said.His chief accomplishment is that he proved five mathematical theorems, including the Stone-Weierstrass Theorem of functional analysis, the Stone-Cech Compactification in topology and a representation theorem for Boolean algebra, the logic that governs computers.