Leon Birnbaum (1918–2010) was a Romanian

mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, mathematical structure, structure, space, Mathematica ...

and

philosopher Philosophy ('love of wisdom' in Ancient Greek) is a systematic study of general and fundamental questions concerning topics like existence, reason, knowledge, Value (ethics and social sciences), value, mind, and language. It is a rational an ...

. He was born in

Chernovtsy Chernivtsi (, ; , ;, , see also #Names, other names) is a city in southwestern Ukraine on the upper course of the Prut River. Formerly the capital of the historic region of Bukovina, which is now divided between Romania and Ukraine, Chernivt ...

(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, Birnbaum was deported to Magilev-Podolsk in

Transnistria Transnistria, officially known as the Pridnestrovian Moldavian Republic and locally as Pridnestrovie, is a Landlocked country, landlocked Transnistria conflict#International recognition of Transnistria, breakaway state internationally recogn ...

when the war reached Chernovtsy. He remained there 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), Motru River valley, in the eastern part of the county. Nine villages are administered by the town: Ciochiuța, Comanda, Hurducești, Lunca Banului, ...

, 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. It is one of six Romanian county seats lying on the river Danube. "Drobeta" is the name ...

and Dej. Meanwhile, he obtained a degree in Russian Language and Literature, and 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 (; ; ) is a City status in Belgium, city and Municipalities in Belgium, municipality in Wallonia, Belgium. It is the capital both of the Provinces of Belgium, province of Namur Province, Namur and of Wallonia, hosting the Parliament of W ...

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

Ljubljana {{Infobox settlement , name = Ljubljana , official_name = , settlement_type = Capital city , image_skyline = {{multiple image , border = infobox , perrow = 1/2/2/1 , total_widt ...

. He was also a member of

ASTRA Astra (Latin for "stars") may refer to: People * Astra (name) Places * Astra, Chubut, a village in Argentina * Astra (Isauria), a town of ancient Isauria, now in Turkey * Astra, one suggested name for a hypothetical fifth planet that became t ...

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