Richard Dedekind (1831–1916) was a prominent German mathematician known for his contributions to abstract algebra, number theory, and the foundations of mathematics. He is renowned for his work on the construction of the real numbers, including what is now known as the Dedekind cut, a method for defining real numbers using sets of rational numbers.
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Portrait of Richard Dedekind
. Johannes Ganz (1821–1886); ETH-Bibliothek, E-Pics Bildarchiv, doi:10.3932/ethz-a-000046496. Public domain; Commons life-plus-70 and Public Domain Mark. Source and usage information on the linked Wikimedia file page. Source.-Portrait-Portr_11953.jpg){kind=link}