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2. QR decomposition - Wikipedia

   en.wikipedia.org/wiki/QR_decomposition

   Golub & Van Loan (1996, §5.2) call Q 1 R 1 the thin QR factorization of A; Trefethen and Bau call this the reduced QR factorization. [1] If A is of full rank n and we require that the diagonal elements of R 1 are positive then R 1 and Q 1 are unique, but in general Q 2 is not.

3. Invitation to the Dance (film) - Wikipedia

   en.wikipedia.org/wiki/Invitation_to_the_Dance_(film)

   Invitation to the Dance is a 1956 American dance anthology film consisting of three distinct stories, all starring and directed by Gene Kelly. It was the first film Kelly directed on his own, after co-directing three films with Stanley Donen .

4. List of Nissan engines - Wikipedia

   en.wikipedia.org/wiki/List_of_Nissan_engines

   Download QR code; Wikidata item; ... Engines specifically built as a power generator for electric motors ... 2000–present Nissan QR engine — 2.0/2.5 L ...

5. BCH code - Wikipedia

   en.wikipedia.org/wiki/BCH_code

   A BCH code with = is called a narrow-sense BCH code.; A BCH code with = is called primitive.; The generator polynomial () of a BCH code has coefficients from (). In general, a cyclic code over () with () as the generator polynomial is called a BCH code over ().

6. QRpedia - Wikipedia

   en.wikipedia.org/wiki/QRpedia

   Visitors to Derby Museum using a mobile phone to scan a QRpedia QR code. When a user scans a QRpedia QR code on their mobile device, the device decodes the QR code into a Uniform Resource Locator (URL) using the domain name "languagecode.qrwp.org" and whose path (final part) is the title of a Wikipedia article, and sends a request for the article specified in the URL to the QRpedia web server.

7. Free-piston engine - Wikipedia

   en.wikipedia.org/wiki/Free-piston_engine

   Free-piston engine used as a gas generator to drive a turbine. A free-piston engine is a linear, 'crankless' internal combustion engine, in which the piston motion is not controlled by a crankshaft but determined by the interaction of forces from the combustion chamber gases, a rebound device (e.g., a piston in a closed cylinder) and a load device (e.g. a gas compressor or a linear alternator).