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The German Army, Air Force and Police used the Double Playfair cipher as a medium-grade cipher in WWII, based on the British Playfair cipher they had broken early in WWI. [16] They adapted it by introducing a second square from which the second letter of each bigram was selected, and dispensed with the keyword, placing the letters in random order.
The smallest (and unique up to rotation and reflection) non-trivial case of a magic square, order 3. In mathematics, especially historical and recreational mathematics, a square array of numbers, usually positive integers, is called a magic square if the sums of the numbers in each row, each column, and both main diagonals are the same.
Thus the fraction 3 / 4 can be used to represent the ratio 3:4 (the ratio of the part to the whole), and the division 3 ÷ 4 (three divided by four). We can also write negative fractions, which represent the opposite of a positive fraction. For example, if 1 / 2 represents a half-dollar profit, then − 1 / 2 represents ...
A 19th-century gravestone in Llanfyllin, Wales, inscribed in the Theban script and an adaptation of Cistercian numerals; the year 1834 at bottom left is written with the four characters for 1000, 800, 30, and 4, rather than the single character for 1834. Horizontal numbers were the same, but rotated 90 degrees counter-clockwise.
Rochester Institute of Technology has incorporated the puzzle into the pavement in front of the Gene Polisseni Center, an ice hockey arena that opened in 2014, [11] and the Georgia Institute of Technology also installed a landscape art model of the seven bridges in 2018. [12] A popular variant of the puzzle is the Bristol Bridges Walk. [13]
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