Yuri Kondratiev (Ukrainian: Кондратьєв Юрій Григорович; 23 October 1953 – 5 September 2023) was a distinguished Ukrainian mathematician and a professor at Bielefeld University in Germany. He passed away on 5 September 2023, at the age of 69.

Research Interests

Kondratiev specialized in various fields such as:

  • Functional Analysis
  • Mathematical Physics
  • Stochastic Calculus

He was a member of the Kyiv school of functional analysis, which was originally founded by M. Krein and led for many years by Y. Berezansky. Kondratiev’s interest in mathematical physics was significantly influenced by his cooperation with the Moscow seminar in statistical Physics, where he collaborated with scholars like R. Dobrushin, R. Minlos, and Y. Sinai. His papers on stochastics were particularly influenced by his collaboration with A. Skorokhod.


Education and Early Career

  • In 1975, Kondratiev graduated with honors from Kyiv University.
  • In 1979, he completed his Candidate of Sciences with a thesis entitled “Generalized functions in problems of infinite dimensional analysis,” also at Kyiv University.

Further Studies and Academic Positions

  • In 1987, he obtained his Doctor of Sciences degree in the area of “Spectral Analysis of Infinite Dimensional Elliptic Differential Operators.”
  • From 1991, he worked at various academic institutions including the Institute of Mathematics of the National Academy of Sciences of Ukraine, National Pedagogical Dragomanov University in Ukraine, University of Bonn in Germany, and University of Reading in the UK.
  • Starting from 2008, Kondratiev held a full Professor position at Bielefeld University.



  • He authored the book “Spectral Methods in Infinite Dimensional Analysis” (1988), co-authored with Y. Berezansky. The book was later translated into English in 1995.
  • He also co-authored a monograph titled “The Statistical Mechanics of Quantum Lattice Systems,” in collaboration with S. Albeverio, Y. Kozitsky, and M. Röckner.


  • Alongside S. Albeverio and M. Röckner, Kondratiev initiated a systematic study of Continuous Configuration Spaces.
  • A space of stochastic distributions has been named in his honor, known as the Kondratiev space.


The contributions of Yuri Kondratiev to the world of mathematics and physics are numerous and enduring. His work has influenced a range of fields, and his legacy continues to inspire researchers around the world.