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Identification, friend or foe ( IFF) is a combat identification system designed for command and control. It uses a transponder that listens for an interrogation signal and then sends a response that identifies the broadcaster. IFF systems usually use radar frequencies, but other electromagnetic frequencies, radio or infrared, may be used. [1]
The OnePlus 3 (also abbreviated as OP3) is a smartphone produced by OnePlus. It was revealed on 14 June 2016. It was revealed on 14 June 2016. [1] [2] The phone was unveiled in a virtual reality event and OnePlus offered its customers Loop VR headsets to experience the event using their phones, giving away 30,000 free headsets in lieu of a ...
Grandi's series. In mathematics, the infinite series 1 − 1 + 1 − 1 + ⋯, also written. is sometimes called Grandi's series, after Italian mathematician, philosopher, and priest Guido Grandi, who gave a memorable treatment of the series in 1703. It is a divergent series, meaning that it does not have a sum. However, it can be manipulated to ...
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 ...
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1/4 + 1/16 + 1/64 + 1/256 + ⋯. Archimedes' figure with a = 3 4. In mathematics, the infinite series 1 4 + 1 16 + 1 64 + 1 256 + ⋯ is an example of one of the first infinite series to be summed in the history of mathematics; it was used by Archimedes circa 250–200 BC. [1] As it is a geometric series with first term 1 4 and common ratio 1 4 ...
Website. Official website. 2024. The National Amateur Cup, also known as the USASA Amateur Cup, is an American knockout soccer competition open to all amateur teams affiliated with the United States Soccer Federation through United States Adult Soccer Association (USASA). The National Amateur Cup began in 1923 in response to the number of teams ...
Boiling point. 145 °C (293 °F; 418 K) [1] Hazards. Flash point. 20 °C (68 °F; 293 K) Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references. N,N′-Dimethyl-1,3-propanediamine (DMPA) is a chemical crosslinking reagent.