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A Langford pairing for n = 4. In combinatorial mathematics, a Langford pairing, also called a Langford sequence, is a permutation of the sequence of 2n numbers 1, 1, 2, 2, ..., n, n in which the two 1s are one unit apart, the two 2s are two units apart, and more generally the two copies of each number k are k units apart. Langford pairings are ...
1,2-Indandione is an organic compound with the molecular formula C 6 H 4 (CO) 2 CH 2. A yellow solid, it is classified as a vicinal diketone on an indane framework. [1] 1,2-Indandione is used in the first stage of forensic identification of latent fingerprints. It is particularly useful for paper, and for items printed with thermal inks such as ...
Bluetooth is a short-range wireless technology standard that is used for exchanging data between fixed and mobile devices over short distances and building personal area networks (PANs). In the most widely used mode, transmission power is limited to 2.5 milliwatts, giving it a very short range of up to 10 metres (33 ft).
The geometric series on the real line. In mathematics, the infinite series 1 2 + 1 4 + 1 8 + 1 16 + ··· is an elementary example of a geometric series that converges absolutely. The sum of the series is 1. In summation notation, this may be expressed as. The series is related to philosophical questions considered in antiquity, particularly ...
Viète. de Moivre. Euler. Fourier. v. t. e. In trigonometry, trigonometric identities are equalities that involve trigonometric functions and are true for every value of the occurring variables for which both sides of the equality are defined. Geometrically, these are identities involving certain functions of one or more angles.
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4.3.2.1. follows four spirited young women who get caught up with a diamond theft heist. Clarke wrote 4.3.2.1. with the intention of making a more mainstream film in regards to his previous work, Kidulthood Adulthood and West 10 LDN, which were gritty crime drama films set in West London. 4.3.2.1 was released in the United Kingdom on 2 June ...
The Presidential Brigade "Hetman Bohdan Khmelnytskyi" (Ukrainian: Окрема президентська бригада імені гетьмана Богдана Хмельницького, romanized: Okrema prezydentska bryhada imeni hetmana Bohdana Khmelnytskoho) is a special military unit of Ukraine and its Armed Forces which is mandated to defend the president of Ukraine in his duty as ...