Nikolai+Trubetzkoy

=//__** Nikolai Sergeyevich Trubetzkoy (also Trubetskoy) **__//=

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Nikolai Sergeyevich was born in April 16 in Moscow.
====Trubetzkoy was born into an extremely refined environment. His father, **Sergei Nikolaevich Trubetskoy** was a first-rank philosopher whose lineage ascended to the medieval rulers of Lithuania. Trubetzkoy graduated from the Moscow University in 1913, he delivered lectures there until the revolution. Thereafter he moved first to the university of Rostov-na-Donu, then to the University of Sofia (1920-22), and finally took the chair of Professor of Slavic Philology at the University of Vienna (1922-1938).====

__**Contribution**__
====Trubetzkoy's chief contributions to linguistics lie in the domain of phonology, in particular in analyses of the phonological systems of individual languages and in the search for general and universal phonological laws. His magnum opus,Grundzüge der Phonologie (Principles of Phonology), was issued posthumously. In this book he famously defined the phoneme as the smallest distinctive unit within the structure of a given language. This work was crucial in establishing phonology as a discipline separate from phonetics.====

__** References **__

 * 1) ====Anderson, Stephen R. (1985). //Phonology in the Twentieth Century. Theories of Rules and Theories of Representations//. Chicago: The University of Chicago Press. pp 83–116.====
 * 2) ====Trubetzkoy, N. (1939). Grundzüge der Phonologie. //Travaux du cercle linguistique de Prague// 7.====