 In January 1946 they registered the Institute as a legal person, specifically an NGO, with the Ilfov County Court.On June 9, 1948 the new Communist regime revamped the Romanian Academy to an institution modeled on the Academy of Sciences of the USSR, increasing by 1966 the number of its member research centers and institutes from 7 to 56.Among the newly created institutes was the "Institute of Mathematics of the Romanian Academy", established in 1949 on the basis of the previous NGO with the contribution of Simion Stoilow, one of the twenty founding members from 1945.