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  2. QR code - Wikipedia

    en.wikipedia.org/wiki/QR_Code

    The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. [6] [7] [8] The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; [9] the pattern of position detection was found and determined by applying the least-used ratio (1:1:3 ...

  3. Worksheet - Wikipedia

    en.wikipedia.org/wiki/Worksheet

    In accounting, a worksheet is, or was, a sheet of ruled paper with rows and columns on which an accountant could record information or perform calculations. These are often called columnar pads, and typically green-tinted. In computing, spreadsheet software presents, on a computer monitor, a user interface that resembles one or more paper ...

  4. List of Facebook features - Wikipedia

    en.wikipedia.org/wiki/List_of_Facebook_features

    Listen with Friends. Listen with Friends allows Facebook users to listen to music and discuss the tunes using Facebook Chat with friends at the same time. Users can also listen in as a group while one friend acts as a DJ. Up to 50 friends can listen to the same song at the same time, and chat about it.

  5. Facebook - Wikipedia

    en.wikipedia.org/wiki/Facebook

    For example, a Facebook user can link their email account to their Facebook to find friends on the site, allowing the company to collect the email addresses of users and non-users alike. [411] Over time, countless data points about an individual are collected; any single data point perhaps cannot identify an individual, but together allows the ...

  6. Oak National Academy - Wikipedia

    en.wikipedia.org/wiki/Oak_National_Academy

    Oak National Academy is an organisation providing an online classroom and resource hub in the UK. It provides teachers with free lessons and resources for pupils aged from 4 to 16, from reception to year 11. [1] Oak also includes a specialist curriculum for supporting pupils who normally attend specialist settings.

  7. QR decomposition - Wikipedia

    en.wikipedia.org/wiki/QR_decomposition

    QR decomposition. In linear algebra, a QR decomposition, also known as a QR factorization or QU factorization, is a decomposition of a matrix A into a product A = QR of an orthonormal matrix Q and an upper triangular matrix R. QR decomposition is often used to solve the linear least squares (LLS) problem and is the basis for a particular ...

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