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  2. Table of mathematical symbols by introduction date - Wikipedia

    en.wikipedia.org/wiki/Table_of_mathematical...

    middle dot (for multiplication) 1698 (perhaps deriving from a much earlier use of middle dot to separate juxtaposed numbers) division slash (a.k.a. solidus )

  3. Multiplication table - Wikipedia

    en.wikipedia.org/wiki/Multiplication_table

    In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system. The decimal multiplication table was traditionally taught as an essential part of elementary arithmetic around the world, as it lays the foundation for arithmetic operations ...

  4. History of quaternions - Wikipedia

    en.wikipedia.org/wiki/History_of_quaternions

    The formulae for the multiplication of quaternions are implicit in the four squares formula devised by Leonhard Euler in 1748. In 1840, Olinde Rodrigues used spherical trigonometry and developed a formula closely related to quaternion multiplication in order to describe the new axis and angle of two combined rotations. [3] [4]: 9

  5. Timeline of mathematics - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_mathematics

    This is a timeline of pure and applied mathematics history.It is divided here into three stages, corresponding to stages in the development of mathematical notation: a "rhetorical" stage in which calculations are described purely by words, a "syncopated" stage in which quantities and common algebraic operations are beginning to be represented by symbolic abbreviations, and finally a "symbolic ...

  6. Multiplication - Wikipedia

    en.wikipedia.org/wiki/Multiplication

    Multiplication can also be thought of as scaling. Here, 2 is being multiplied by 3 using scaling, giving 6 as a result. Animation for the multiplication 2 × 3 = 6 4 × 5 = 20. The large rectangle is made up of 20 squares, each 1 unit by 1 unit. Area of a cloth 4.5m × 2.5m = 11.25m 2; 4 ⁠ 1 / 2 ⁠ × 2 ⁠ 1 / 2 ⁠ = 11 ⁠ 1 / 4 ⁠

  7. Congo says mysterious disease killing dozens of kids finally ...

    www.aol.com/congo-says-mysterious-disease...

    At least 592 cases were reported after the alert was first raised by Congo's health ministry on Oct. 29. The ministry said the disease had a fatality rate of 6.25%.

  8. First time flying first class? Here are etiquette tips to ...

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    First-time flight upgraders should be aware of business- and first-class etiquette. A flight expert shared his top tips for blending in with passengers who often book premium cabins.

  9. Exercise book - Wikipedia

    en.wikipedia.org/wiki/Exercise_book

    6 for 60 pages; 8 for 80 pages; The third numeral stands for the ruling: 0 for blank exercise book; 1 for lined paper—lines at 20 mm; 2 for lined paper—lines at 16 mm; 3 for lined paper—lines at 12 mm; 4 for lined paper—lines at 8 mm; 5 for squared paper—squares are 5 x 5 mm; 10 for squared paper—squares are 10 x 10 mm

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