Definition
Bernhard Riemann (1826–1866) was a revolutionary German mathematician. He made significant contributions to areas like analysis, number theory, and geometry. Think of him as a mathematical explorer charting new territories. He introduced concepts like Riemann surfaces and the famous (and still unsolved) Riemann hypothesis. His work underlies much of modern physics, including Einstein's theory of relativity, which uses the geometry he developed. He provided crucial tools for understanding the structure of space-time.