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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. [5] [6] [7] 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; [8] the pattern of position detection was found and determined by applying the least-used ratio (1:1:3 ...

  3. Tensor product of representations - Wikipedia

    en.wikipedia.org/wiki/Tensor_product_of...

    In mathematics, the tensor product of representations is a tensor product of vector spaces underlying representations together with the factor-wise group action on the product. This construction, together with the Clebsch–Gordan procedure, can be used to generate additional irreducible representations if one already knows a few.

  4. Frobenius–Schur indicator - Wikipedia

    en.wikipedia.org/wiki/Frobenius–Schur_indicator

    Frobenius–Schur indicator. In mathematics, and especially the discipline of representation theory, the Schur indicator, named after Issai Schur, or Frobenius–Schur indicator describes what invariant bilinear forms a given irreducible representation of a compact group on a complex vector space has. It can be used to classify the irreducible ...

  5. Low-rank approximation - Wikipedia

    en.wikipedia.org/wiki/Low-rank_approximation

    Low-rank approximation. In mathematics, low-rank approximation refers to the process of approximating a given matrix by a matrix of lower rank. More precisely, it is a minimization problem, in which the cost function measures the fit between a given matrix (the data) and an approximating matrix (the optimization variable), subject to a ...

  6. Barcode - Wikipedia

    en.wikipedia.org/wiki/Barcode

    Barcode. A UPC-A barcode. A barcode or bar code is a method of representing data in a visual, machine-readable form. Initially, barcodes represented data by varying the widths, spacings and sizes of parallel lines. These barcodes, now commonly referred to as linear or one-dimensional (1D), can be scanned by special optical scanners, called ...

  7. Aztec Code - Wikipedia

    en.wikipedia.org/wiki/Aztec_Code

    The symbol is built on a square grid with a bull's-eye pattern at its centre for locating the code. Data is encoded in concentric square rings around the bull's-eye pattern. The central bull's-eye is 9×9 or 13×13 pixels , and one row of pixels around that encodes basic coding parameters, producing a "core" of 11×11 or 15×15 squares.

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