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2. Pi - Wikipedia

   en.wikipedia.org/wiki/Pi

   The number π (/ p aɪ /; spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159.The number π appears in many formulae across mathematics and physics.

3. Amazon Pay - Wikipedia

   en.wikipedia.org/wiki/Amazon_Pay

   Amazon Pay Express is a payments processing service for simple e-commerce use cases on websites. It is built on Amazon Pay but without requiring a full e-commerce integration, [6] it can be used to create a button that can be copied and pasted onto a website or added via a WordPress plug-in. [7] It is best suited for merchants selling a small number of products with a single item in each order ...

4. Statistics - Wikipedia

   en.wikipedia.org/wiki/Statistics

   Statistics is a mathematical body of science that pertains to the collection, analysis, interpretation or explanation, and presentation of data, [8] or as a branch of mathematics. [9]

5. Square root of 7 - Wikipedia

   en.wikipedia.org/wiki/Square_root_of_7

   The rectangle that bounds an equilateral triangle of side 2, or a regular hexagon of side 1, has size square root of 3 by square root of 4, with a diagonal of square root of 7. A Logarex system Darmstadt slide rule with 7 and 6 on A and B scales, and square roots of 6 and of 7 on C and D scales, which can be read as slightly less than 2.45 and ...

6. Tetration - Wikipedia

   en.wikipedia.org/wiki/Tetration

   Unlike square roots, determining the number of square super-roots of x may be difficult. In general, if / < <, then x has two positive square super-roots between 0 and 1; and if >, then x has one positive square super-root greater than 1.

7. Newton's method - Wikipedia

   en.wikipedia.org/wiki/Newton's_method

   An illustration of Newton's method. In numerical analysis, Newton's method, also known as the Newton–Raphson method, named after Isaac Newton and Joseph Raphson, is a root-finding algorithm which produces successively better approximations to the roots (or zeroes) of a real-valued function.