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2. For sale: baby shoes, never worn - Wikipedia

   en.wikipedia.org/wiki/For_sale:_baby_shoes...

   v. t. e. "For sale: baby shoes, never worn." is a six-word story, one of the most famous examples of flash fiction. Versions of the story date back to the early 1900s, and it was being reproduced and expanded upon within a few years of its initial publication. [ 1][ 2] The story is popularly misattributed to Ernest Hemingway; this is ...

3. Trachtenberg system - Wikipedia

   en.wikipedia.org/wiki/Trachtenberg_system

   Trachtenberg system. The Trachtenberg system is a system of rapid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly. It was developed by the Russian engineer Jakow Trachtenberg in order to keep his mind occupied while being in a Nazi concentration ...

4. Shoelace formula - Wikipedia

   en.wikipedia.org/wiki/Shoelace_formula

   Shoelace formula. The shoelace formula, also known as Gauss's area formula and the surveyor's formula, [1] is a mathematical algorithm to determine the area of a simple polygon whose vertices are described by their Cartesian coordinates in the plane. [2] It is called the shoelace formula because of the constant cross-multiplying for the ...

5. Multiplication - Wikipedia

   en.wikipedia.org/wiki/Multiplication

   Multiplication (often denoted by the cross symbol ×, by the mid-line dot operator ⋅, by juxtaposition, or, on computers, by an asterisk *) is one of the four elementary mathematical operations of arithmetic, with the other ones being addition, subtraction, and division. The result of a multiplication operation is called a product .

6. Payless (footwear retailer) - Wikipedia

   en.wikipedia.org/wiki/Payless_(footwear_retailer)

   Payless ShoeSource Worldwide, LLC[ 3] (formerly known as Payless ShoeSource Inc. ), is an American multinational discount footwear chain. Established in 1956 by cousins Louis and Shaol Pozez, Payless was a privately held company owned by Blum Capital, and Golden Gate Capital. In 1961, it became a public company as the Volume Shoe Corporation ...

7. Multiply perfect number - Wikipedia

   en.wikipedia.org/wiki/Multiply_perfect_number

   In mathematics, a multiply perfect number (also called multiperfect number or pluperfect number) is a generalization of a perfect number . For a given natural number k, a number n is called k-perfect (or k-fold perfect) if the sum of all positive divisors of n (the divisor function, σ ( n )) is equal to kn; a number is thus perfect if and only ...