Solomon Mikhlin

'''Solomon Grigor'evich Mikhlin (, real name Zalman Girshevich Mikhlin) (the family name is also transliterated as Mihlin or Michlin''') (23 April 1908 – 29 August 1990) was a Soviet mathematician of who worked in the fields of linear elasticity, singular integrals and numerical analysis: he is best known for the introduction of the symbol of a singular integral operator, which eventually led to the foundation and development of the theory of pseudodifferential operators. Provided by Wikipedia