Leon Birnbaum (1918–2010) was a Romanian mathematician and philosopher. He was born in

Chernovtsy Chernivtsi ( uk, Чернівці́}, ; ro, Cernăuți, ; see also other names) is a city in the historical region of Bukovina, which is now divided along the borders of Romania and Ukraine, including this city, which is situated on the upp ...

(now Ukraine) on June 18, 1918 to a family with an intellectual tradition. He studied at the Orthodox High School, then at the Faculty of Mathematics. In 1941 the war reached Chernovtsy and he was deported to Magilev-Podolsk in

Transnistria Transnistria, officially the Pridnestrovian Moldavian Republic (PMR), is an unrecognised breakaway state that is internationally recognised as a part of Moldova. Transnistria controls most of the narrow strip of land between the Dniester riv ...

until 1944. In 1946 he became a Mathematics teacher in

Strehaia Strehaia () is a town in Mehedinți County, Oltenia, Romania. It is situated on the Motru River valley, in the eastern part of the county. Forests in the vicinity are home to the largest Hermann's tortoise colonies in Oltenia. Nine villages ar ...

, Romania, then at

Turnu Severin Drobeta-Turnu Severin (), colloquially Severin, is a city in Mehedinți County, Oltenia, Romania, on the northern bank of the Danube, close to the Iron Gates. "Drobeta" is the name of the ancient Dacian and Roman towns at the site, and the modern ...

and

Dej Dej (; hu, Dés; german: Desch, Burglos; yi, דעעש ''Desh'') is a municipality in Transylvania, Romania, north of Cluj-Napoca, in Cluj County. It lies where the river Someșul Mic meets the river Someșul Mare. The city administers four vill ...

. Meanwhile, he obtained a degree in Russian Language and Literature, then an engineering license in Machine Technology. Encouraged by friends, Birnbaum began to publish Mathematical articles in the journals "Mathematical Studies and Research" of Bucharest, "Notre Dame Journal of Formal Logics" in the USA and many others. He was a member of the "Association Internationale de Cybernetique" in

Namur, Belgium Namur (; ; nl, Namen ; wa, Nameur) is a city and municipality in Wallonia, Belgium. It is both the capital of the province of Namur and of Wallonia, hosting the Parliament of Wallonia, the Government of Wallonia and its administration. Namu ...

and a member of the Editorial Board of the magazine "Informatica", in

Ljubljana Ljubljana (also known by other historical names) is the capital and largest city of Slovenia. It is the country's cultural, educational, economic, political and administrative center. During antiquity, a Roman city called Emona stood in the ar ...

. He was also a member of ASTRA.

Books

* ''An Introduction to Logosophy'', Litera, Bucharest, 1983. * ''Multa et Multum'', Litera, Bucharest, 1984. * ''An Essay on a Finite Ontology'', Aletheia, Bistrita, 1999. * ''Tripolar Algebra and Elements of Quadripolar Algebra'', Aletheia, Bistrita, 2000. * ''A Finite Cosmology and Matters of Theosophy and of the Axiomatic'', Aletheia, Bistrita, 2001. * ''An Introduction to Aletheutics'', Aletheia, Bistrita, 2001. * ''Theatre'', Aletheia, Bistrita, 2001. {{DEFAULTSORT:Birnbaum, Leon 1918 births 2010 deaths Romanian mathematicians Romanian logicians 20th-century Romanian philosophers Scientists from Chernivtsi