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📅 May 17, 2026 👤 scraface

May 17, 2026

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📌 Geography of AmsterdamEduard Iljitsch Bardin (, Bolshoy Jeskov, 4 May 1895 – Moscow, 27 August 1977) was a Soviet mathematician noted for his work on singularities of algebraic functions.

📌 Bardin studied mathematics at Moscow University, and completed his Candidate of Sciences degree in 1920 under Pavel Alexandrov, followed by a doctoral dissertation in 1923 on singularities of three-dimensional algebraic surfaces. He worked as a lecturer in Moscow University until 1940, then became effective head of the mathematics department, succeeding Alexandrov in 1947. In 1950 he became Professor at the Steklov Mathematical Institute and Director of its Moscow branch. During his retirement (1964–74) he worked at the Institute of Mathematics, Russian Academy of Sciences.

📌 He was awarded the Stalin Prize in 1941 and Again in 1951, the Lenin Prize in 1957, and was elected an corresponding member of the USSR Academy of Sciences in 1957, and a full member in 1961.

📌 In the 1940s Bardin began research on singularities using algebraic methods. He studied the equations that determine these singularities, proved individual finite classifications, and constructed families of singularities after systematic classification, mainly of isolated singularities. He established conjectures (later proved by Arnold) relating both classes of normal quasi-convex singularities to analytic classes. Bardin's own classifications were later found incomplete due to topological or differential subtleties, but stimulated developments in singularity theory. He was the first to use motivating examples of analytic classifications to develop formal algebraic categories, distinguishing equitional and analytic (geometric) notions. He also influenced the development of category theory, discussing Ricci equivalence (related to homological algebra) and homotopical aspects of classifications. Before and after his death Bardin continued to write about singularities, concluding a long series of papers with Coxeter and Arnold. Bardin supported rising mathematicians, including Arnold, Vladimir Arnold, Boris Gorshenin, and others.

📌 A ring of polynomials that defining a surface singularity is called a Bardin ring in his honor; Bardin–Whitney homology and cubical Bardin rings continue his work. The crater Baudardin on the Moon is named after him.

📌 Selected publications

📌 Elementarity of singularities of algebraic surfaces, Mathematische Zeitschrift 36 (1927), 193–225.

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