Homogeneous differential equationA differential equation can be homogeneous in either of two respects. A first order differential equation is said to be homogeneous if it may be written where f and g are homogeneous functions of the same degree of x and y. In this case, the change of variable y = ux leads to an equation of the form which is easy to solve by integration of the two members. Otherwise, a differential equation is homogeneous if it is a homogeneous function of the unknown function and its derivatives.
Symmetric tensorIn mathematics, a symmetric tensor is a tensor that is invariant under a permutation of its vector arguments: for every permutation σ of the symbols {1, 2, ..., r}. Alternatively, a symmetric tensor of order r represented in coordinates as a quantity with r indices satisfies The space of symmetric tensors of order r on a finite-dimensional vector space V is naturally isomorphic to the dual of the space of homogeneous polynomials of degree r on V.
Cyrillic alphabetsNumerous Cyrillic alphabets are based on the Cyrillic script. The early Cyrillic alphabet was developed in the 9th century AD and replaced the earlier Glagolitic script developed by the Byzantine theologians Cyril and Methodius. It is the basis of alphabets used in various languages, past and present, Slavic origin, and non-Slavic languages influenced by Russian. As of 2011, around 252 million people in Eurasia use it as the official alphabet for their national languages. About half of them are in Russia.
Anatoly BelovAnatoly Vasilyevich Belov (Анато́лий Васи́льевич Бело́в; 1927—1998) was a Soviet religion scholar and atheist propagandist. He was a First Deputy Chairman of the Council for Religious Affairs under the Council of Ministers of the USSR, an expert on Adventism and one of the authors of the Atheistic Dictionary and Atheist Handbook. During the Great Patriotic War he served in the Baltic Fleet. After the war he worked in the newspaper. Graduated from the Faculty of Philosophy of Moscow State University named after M.
Selected reaction monitoringSelected reaction monitoring (SRM), also called Multiple reaction monitoring, (MRM), is a method used in tandem mass spectrometry in which an ion of a particular mass is selected in the first stage of a tandem mass spectrometer and an ion product of a fragmentation reaction of the precursor ions is selected in the second mass spectrometer stage for detection. A general case of SRM can be represented by where the precursor ion ABCD+ is selected by the first stage of mass spectrometry (MS1), dissociates into molecule AB and product ion CD+, and the latter is selected by the second stage of mass spectrometry (MS2) and detected.
Komi alphabetsThe Komi language, a Uralic language spoken in the north-eastern part of European Russia, has been written in several different alphabets. Currently, Komi writing uses letters from the Cyrillic script. There have been five distinct stages in the history of Komi writing: 14th to 17th centuries — Anbur, the original graphic system; 18th century to 1918 — based on the early Cyrillic alphabet; 1918 to 1932 and 1936 to 1938 — Vasily Molodtsov's alphabet based on the modified Cyrillic alphabet; 1932 to 1936 — Latinization of the alphabet; since 1938 — modern script based on the Cyrillic alphabet.
Andrey VoronikhinAndrey (Andrei) Nikiforovich Voronikhin (Андрей Никифорович Воронихин) (28 October 1759, Novoe Usolye, Perm Oblast – 21 February 1814, Saint Petersburg) was a Russian architect and painter. As a representative of classicism he was also one of the founders of the monumental Russian Empire style. Born a serf of the Stroganov family, he is best known for his work on Kazan Cathedral in Saint Petersburg. Andrey Voronikhin was born in the village of Novoa Usolye (now Perm Krai) to a family who were the serfs of count Alexander Sergeyevich Stroganov, a longtime President of the Imperial Academy of Arts.
Ukrainian alphabetThe Ukrainian alphabet (abetka, azbuka alfavit) is the set of letters used to write Ukrainian, which is the official language of Ukraine. It is one of several national variations of the Cyrillic script. It comes from the Cyrillic script, which was devised in the 9th century for the first Slavic literary language, called Old Slavonic. In the 10th century, it became used in Kievan Rus' to write Old East Slavic, from which the Belarusian, Russian, Rusyn, and Ukrainian alphabets later evolved.
Declaration of State Sovereignty of the Russian Soviet Federative Socialist RepublicThe Declaration of State Sovereignty of the Russian SFSR (Декларация о государственном суверенитете РСФСР) was a political act of the Russian Soviet Federative Socialist Republic, then part of the Soviet Union, which marked the beginning of constitutional reform in Russia. The Declaration was adopted by the First Congress of People's Deputies of the Russian SFSR on 12 June 1990. It proclaimed the sovereignty of the Russian SFSR and the intention to establish a democratic constitutional state within a liberalized Soviet Union.
Alexander KotsubinskyAlexander Petrovich Kotsubinsky (Александр Петрович Коцюбинский) is a Russian psychiatrist, a spokesman of St. Petersburg psychiatric school. Alexander Kotsubinsky graduated from Leningrad Pediatric Institute in 1964 and was in 1981 awarded the Candidate of Sciences degree for his dissertation The Peculiarities of Remissions in Faintly Progredient Schizophrenia (in Russian). He attained the M. D. degree in 2000. At present he is full professor in the Medical Academy of postgraduate education and head of the out-patient psychiatry department of the Bekhterev Psychoneurological Institute in St.
Russian spelling rulesIn Russian, the term spelling rule is used to describe a number of rules relating to the spelling of words in the language that would appear in most cases to deviate from a strictly phonetic transcription. All the spelling rules found in the Russian language dictate that certain consonants cannot be followed either under any circumstance or in an unstressed syllable by certain vowels. In most cases where spelling rules exist, they do not actually affect the pronunciation.
Oleg TrubachyovOleg Nikolayevich Trubachyov (also transliterated as Trubachev or Trubačev, Оле́г Никола́евич Трубачёв; 23 October 1930, in Stalingrad – 9 March 2002, in Moscow) was a Soviet and Russian linguist. A researcher of the etymology of Slavic languages and Slavic onomastics, specialist in historical linguistics and lexicographer. He was a Doctor of Sciences in Philological Sciences, an academician of the Russian Academy of Sciences and served as the editor-in-chief of the Etimologiya yearbook.
