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Of aluminium isotopes, only 27Al is stable. This situation is common for elements with an odd atomic number. It is the only primordial aluminium isotope, i.e. the only one that has existed on Earth in its current form since the formation of the planet. It is therefore a mononuclidic element and its standard atomic weight is virtually the same as that of the isotope.
Eigenvalues and eigenvectors. In linear algebra, it is often important to know which vectors have their directions unchanged by a given linear transformation. An eigenvector ( / ˈaɪɡən -/ EYE-gən-) or characteristic vector is such a vector. Thus an eigenvector of a linear transformation is scaled by a constant factor when the linear ...
Sigma (/ˈsɪɡmə/ SIG-mə;[1] uppercase Σ, lowercase σ, lowercase in word-final position ς; Greek: σίγμα) is the eighteenth letter of the Greek alphabet. In the system of Greek numerals, it has a value of 200. In general mathematics, uppercase Σ is used as an operator for summation. When used at the end of a letter-case word (one ...
Early years Jorge Mario Bergoglio (fourth boy from the left in the third row from the top) at age 12, Salesian College (c. 1948–49) Pope Francis was born as Jorge Mario Bergoglio on 17 December 1936 in Flores, a neighbourhood of Buenos Aires. He was the eldest of five children of Mario José Bergoglio (1908–1959) and Regina María Sívori (1911–1981).
The Wagner Group (Russian: Группа Вагнера, romanized: Gruppa Vagnera ), officially known as PMC Wagner [9] (Russian: ЧВК «Вагнер», romanized: ChVK «Vagner» [63] ), is a Russian state-funded [64] private military company (PMC) controlled until 2023 by Yevgeny Prigozhin, a former close ally of Russia's president Vladimir ...
Croatia's non-native name derives from Medieval Latin Croātia, itself a derivation of North-West Slavic *Xərwate, by liquid metathesis from Common Slavic period *Xorvat, from proposed Proto-Slavic *Xъrvátъ which possibly comes from the 3rd-century Scytho-Sarmatian form attested in the Tanais Tablets as Χοροάθος (Khoroáthos, alternate forms comprise Khoróatos and Khoroúathos).
0 (zero) is a number representing an empty quantity. Adding 0 to any number leaves that number unchanged. In mathematical terminology, 0 is the additive identity of the integers, rational numbers, real numbers, and complex numbers, as well as other algebraic structures. Multiplying any number by 0 has the result 0, and consequently, division ...
