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4-Phenyl-1,2,4-triazoline-3,5-dione (PTAD) is an azodicarbonyl compound. PTAD is one of the strongest dienophiles and reacts rapidly with dienes in Diels-Alder reactions . [ 1 ] The most prominent use of PTAD was the first synthesis of prismane in 1973.
The following is a complete list of the 249 current officially assigned ISO 3166-1 alpha-2 codes, with the following columns: [1] Code: ISO 3166-1 alpha-2 code, pointing to its ISO 3166-2 article; Country name: English short name officially used by the ISO 3166 Maintenance Agency (ISO 3166/MA)
4 3 2 1 is a novel by Paul Auster published in January 2017. At the time of its publication, it was the first new Auster novel to have appeared in seven years. [1] [2] Auster worked on the book seven days a week for three-and-a-half-years and wrote it in long hand.
The partial sums of the series 1 + 2 + 3 + 4 + 5 + 6 + ⋯ are 1, 3, 6, 10, 15, etc.The nth partial sum is given by a simple formula: = = (+). This equation was known ...
The first four partial sums of 1 + 2 + 4 + 8 + ⋯. In mathematics, 1 + 2 + 4 + 8 + ⋯ is the infinite series whose terms are the successive powers of two. As a geometric series, it is characterized by its first term, 1, and its common ratio, 2. As a series of real numbers it diverges to infinity, so the sum of this series is infinity.
An example of a five-numbered formation would be 4–1–2–1–2, where the midfield consists of a defensive midfielder, two central midfielders and an offensive midfielder; this is sometimes considered to be a kind of 4–4–2 (specifically a 4–4–2 diamond, referring to the lozenge shape formed by the four midfielders).
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