Ivan Vidav was born in Opčine near Trieste (Slovenian Trst), Italy. He is Josip Plemelj's student. Vidav got his Ph.D under Plemelj's advisory in 1941 at the University of Ljubljana with a dissertation Kleinovi teoremi v teoriji linearnih diferencialnih enačb (Klein's theorems in the theory of linear differential equations).
From 1988 he is a honourable member of the Society of mathematicians, physicists and astronomers of Slovenia (DMFA).
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