Discusses Pioneers InNineteenth Century *Bv Dorothy Scovil '40wOn Tuesday evening Dr, Henry Seelv White, Professor Emeritus of Mathematics, and a member of the American Academy of Sciences gave an illustrated lecture on ‘Four Mathematicians of the Nineteenth Century.The last century was a period of great activity in all of the sciences, and there was an increasing emphasis on pure mathematics. The work of these men opened new fields of mathematical investigation and made possible the great advances in modern physics and other sciences.Gauss is World-FamedKarl Friedrich Gauss ( 1777-1855) was considered the greatest mathematician of his time, not only in Germany, but in all the world. He devised a graphical method for representing imaginary numbers, which formed the basis for the study of the theory of the functions of a complex variable; he established the method of least squares; and proved the fundamental theorem of algebra. Gauss was also an astronomer of note, and was the director of the observatory at Gottingen.Contributed To Pure MathThe great English mathematician Arthur Cayley (1821-1895) made many contributions to pure mathematics, including the theory of invariance, geometry of n dimensions, and theory of matrices, thus preparing the way for Einstein's work*During his short life (1826-1866) Bernhard Riemann of Germany framed many new questions and proved new theorems in puremathematics.He is particularly known for his foundations of the general theory of the function of a complex variable. for his device of a surface of many sheets to represent multiple valued functions, and for his new non-Euclidean geometry,Poincare Was Famous ModernThe most widely known and celebrated mathematician of recent years was Henri Poincare (1854-1912) who made contributions to all branches of pure math-(Continued on page 4, col. 3)