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A pinwheel calculator is a class of mechanical calculator described as early as 1685, and popular in the 19th and 20th century, calculating via wheels whose number of teeth were adjustable. These wheels, also called pinwheels, could be set by using a side lever which could expose anywhere from 0 to 9 teeth, and therefore when coupled to a ...
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As any universal Turing machine can do what any other Turing machine can, a central calculator in principle has no advantage over a system of dispersed calculators, i.e. a market, or vice versa. [25] In some economic models, finding an equilibrium is hard, and finding an Arrow–Debreu equilibrium is PPAD-complete. If the market can find an ...
Another popular calculator watch was the Time Computer Calculator 901, which could perform basic arithmetic functions. The 902 models had additional functions such as percentage calculations. The Time watches carried a high price tag (US$4,000) because they were made of solid gold and operated by a stylus pen owing to the small size of their ...
6.3 Dripping Faucets. 10 comments. 6.4 Weight. 9 comments. 6.5 Weight of the Earth. ... in those cases the money ges back into the cost of production of the journals ...
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There are five calculators in the 49/50 series of HP graphing calculators. These calculators have both algebraic and RPN entry modes, and can perform numeric and symbolic calculations using the built-in Computer Algebra System (CAS) , which is an improved ALG48 and Erable combination from the HP 48 series .