Gennadi Vainikko

Gennadi Vainikko (31 May 1938 – 1 November 2024) was an Estonian mathematician known for his work in numerical functional analysis, approximation methods, and the theory and numerical solution of integral, integro-differential and operator equations. He was a member of the Estonian Academy of Sciences from 1986 and served as one of its vice-presidents from 1990 to 1994. He was also professor emeritus at the University of Tartu. Vainikko died in Tartu on 1 November 2024 at the age of 86.

Early life and education Vainikko was born in Kondopoga in Soviet Karelia on 31 May 1938.

After postgraduate study at Tartu, he defended his Candidate of Sciences dissertation in 1964 on the precision of Galerkin-type methods.

He was elected to the Estonian Academy of Sciences in 1986 in mathematics.

Research Vainikko's research covered numerical functional analysis, projection and approximation methods, ill-posed and inverse problems, and the theory and numerical treatment of integral, integro-differential and pseudodifferential equations.

According to tribute articles and memorial notices, he published more than 230 scientific papers and 12 monographs, later exceeding 300 publications overall, and supervised more than 30 doctoral and candidate dissertations. A conference at the University of Tartu in 2013 was dedicated to his 75th birthday.

Honours Vainikko received the honorary title of Merited Scientist of the Estonian SSR in 1989. In 1998 he was awarded the Order of the White Star, 3rd Class, and the Medal of the Estonian Academy of Sciences.

He became an honorary member of the Estonian Mathematical Society in 2006 and received the University of Tartu Badge of Distinction in the same year. In 2011 he received Estonia's national science prize in exact sciences for the research cycle Cordial Volterra Integral Equations. He received the University of Tartu Medal in 2013. In 2017 he received Estonia's lifetime achievement award in science and research.

Selected works