What organization or association or team did Vito Volterra join in 1910?
Vito Volterra Biography . Born in Ancona , then part of the Papal States , into a very poor Jewish family : his father was Abramo Volterra and mother , Angelica Almagia . Volterra showed early promise in mathematics before attending the University of Pisa , where he fell under the influence of Enrico Betti , and where he became professor of rational mechanics in 1883 . He immediately started work developing his theory of functionals which led to his interest and later contributions in integral and integro-differential equations . His work is summarised in his book Theory of functionals and of Integral and Integro-Differential Equations ( 1930 ) . In 1892 , he became professor of mechanics at the University of Turin and then , in 1900 , professor of mathematical physics at the University of Rome La Sapienza . Volterra had grown up during the final stages of the Risorgimento when the Papal States were finally annexed by Italy and , like his mentor Betti , he was an enthusiastic patriot , being named by the king Victor Emmanuel III as a senator of the Kingdom of Italy in 1905 . In the same year , he began to develop the theory of dislocations in crystals that was later to become important in the understanding of the behaviour of ductile materials . On the outbreak of World War I , already well into his 50s , he joined the Italian Army and worked on the development of airships under Giulio Douhet . He originated the idea of using inert helium rather than flammable hydrogen and made use of his leadership abilities in organising its manufacture . After World War I , Volterra turned his attention to the application of his mathematical ideas to biology , principally reiterating and developing the work of Pierre François Verhulst . An outcome of this period is the Lotka–Volterra equations . Volterra is the only person who was a plenary speaker in the International Congress of Mathematicians four times ( 1900 , 1908 , 1920 , 1928 ) . In 1922 , he joined the opposition to the Fascist regime of Benito Mussolini and in 1931 he was one of only 12 out of 1,250 professors who refused to take a mandatory oath of loyalty . His political philosophy can be seen from a postcard he sent in the 1930s , on which he wrote what can be seen as an epitaph for Mussolinis Italy : Empires die , but Euclid’s theorems keep their youth forever . However , Volterra was no radical firebrand ; he might have been equally appalled if the leftist opposition to Mussolini had come to power , since he was a lifelong royalist and nationalist . As a result of his refusal to sign the oath of allegiance to the fascist government he was compelled to resign his university post and his membership of scientific academies , and , during the following years , he lived largely abroad , returning to Rome just before his death . In 1936 , he had been appointed a member of the Pontifical Academy of Sciences , on the initiative of founder Agostino Gemelli . He died in Rome on 11 October 1940 . He is buried in the Ariccia Cemetery . The Academy organised his funeral . Family . In 1900 he married Virginia Almagia , a cousin . Their son Edoardo Volterra ( 1904–1984 ) was a famous historian of Roman law . Volterra also had a daughter , Luisa Volterra , who married Umberto dAncona . DAncona piqued his father-in-laws interest in biomathematics when he showed Vito a set of data regarding populations of different species of fish on the Adriatic Sea , where decreased fishing activity from the war had led to an increase in the populations of predatory fish species . Vito published an analysis of the dynamics of interacting species of fish the next year . Selected writings by Volterra . - 1910 . Leçons sur les fonctions de lignes . Paris : Gauthier-Villars . - 1912 . The theory of permutable functions . Princeton University Press . - 1913 . Leçons sur les équations intégrales et les équations intégro-différentielles . Paris : Gauthier-Villars . - 1926 , Variazioni e fluttuazioni del numero dindividui in specie animali conviventi , Mem . R . Accad . Naz . dei Lincei 2 : 31–113 . - 1926 , Fluctuations in the abundance of a species considered mathematically , Nature 118 : 558–60 . - 1960 . Sur les Distorsions des corps élastiques ( with Enrico Volterra ) . Paris : Gauthier-Villars . - 1930 . Theory of functionals and of integral and integro-differential equations . Blackie & Son . - 1931 . Leçons sur la théorie mathématique de la lutte pour la vie . Paris : Gauthier-Villars . Reissued 1990 , Gabay , J. , ed . - 1954-1962 . Opere matematiche . Memorie e note . Vol . 1 , 1954 ; Vol . 2 , 1956 ; Vol . 3 , 1957 ; Vol . 4 , 1960 ; Vol . 5 , 1962 ; Accademia dei Lincei .