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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. 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; the pattern of position detection was found and determined by applying the least-used ratio (1:1:3:1:1) in black ...

3. Numerical methods for linear least squares - Wikipedia

   en.wikipedia.org/wiki/Numerical_methods_for...

   The numerical methods for linear least squares are important because linear regression models are among the most important types of model, both as formal statistical models and for exploration of data-sets. The majority of statistical computer packages contain facilities for regression analysis that make use of linear least squares computations.

4. 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 ...

5. Hanks' salts - Wikipedia

   en.wikipedia.org/wiki/Hanks'_salts

   Hanks' salts. Hanks' salts is a collective group of salts rich in bicarbonate ions, formulated in 1940 by the microbiologist John H. Hanks. [1] Typically, they are used as a buffer system in cell culture media and aid in maintaining the optimum physiological pH (roughly 7.0–7.4) for cellular growth. Due to their poorly reactive nature and ...

6. Yao's Millionaires' problem - Wikipedia

   en.wikipedia.org/wiki/Yao's_Millionaires'_problem

   The Millionaires' problem is an important problem in cryptography, the solution of which is used in e-commerce and data mining. Commercial applications sometimes have to compare numbers that are confidential and whose security is important. Many solutions have been introduced for the problem, including physical solutions based on cards.

7. Benedict's reagent - Wikipedia

   en.wikipedia.org/wiki/Benedict's_reagent

   Benedict's reagent (often called Benedict's qualitative solution or Benedict's solution) is a chemical reagent and complex mixture of sodium carbonate, sodium citrate, and copper (II) sulfate pentahydrate. [1] It is often used in place of Fehling's solution to detect the presence of reducing sugars. The presence of other reducing substances ...