Ernst Kummer (1810-1893) was a German mathematician known for his contributions to number theory, algebra, and the theory of complex numbers. He is best known for his work on ideal numbers and algebraic structures, especially in the context of algebraic number theory. One of Kummer's significant contributions was the introduction of the concept of "ideal numbers," which he used to address problems related to the factorization of integers in certain number fields.
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Portrait of Ernst Kummer
. Unknown photographer; source: VeryImportantLot, Ernst Eduard Kummer author page. Commons PD-old-assumed and United States pre-1931-publication claims, via Wikimedia Commons. Source.