Felix Klein

One of the greatest German mathematicians of his era, Felix Klein (1849–1925) taught at the University of Göttingen from 1887 until his retirement in 1913. He made major contributions to many areas of mathematics, including group theory, complex analysis, and non-Euclidean geometry. Dover also publishes Klein's classic two-volume work, Elementary Mathematics from an Advanced Standpoint, part one of which focuses on geometry and part two on arithmetic, algebra, and analysis.