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Travelling Salesman, by director Timothy Lanzone, is the story of four mathematicians hired by the U.S. government to solve the most elusive problem in computer-science history: P vs. NP. [77] Solutions to the problem are used by mathematician Robert A. Bosch in a subgenre called TSP art.
Time of concentration. Time of concentration is a concept used in hydrology to measure the response of a watershed to a rain event. It is defined as the time needed for water to flow from the most remote point in a watershed to the watershed outlet. [1] It is a function of the topography, geology, and land use within the watershed.
Journey planner. A journey planner, trip planner, or route planner is a specialized search engine used to find an optimal means of travelling between two or more given locations, sometimes using more than one transport mode. [1] [2] Searches may be optimized on different criteria, for example fastest, shortest, fewest changes, cheapest. [3]
The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. More simply, the speed of sound is how fast vibrations travel. At 20 °C (68 °F), the speed of sound in air is about 343 m/s (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn ), or 1 km in 2.91 s or one mile in 4.69 s.
This is a list of the top 100 cities ranked by the number of international visitors, including all international arrivals by land, air, and sea, for tourist or business purposes. The consulting firm Euromonitor and the financial services corporation Mastercard define the concept of the foreign visitor differently, thus their respective rankings ...
Marchetti's constant. Marchetti's constant is the average time spent by a person for commuting each day. Its value is approximately one hour, or half an hour for a one-way trip. It is named after Italian physicist Cesare Marchetti, though Marchetti himself attributed the "one hour" finding to transportation analyst and engineer Yacov Zahavi.
Works created prior to the 18th century are listed in Time travel § History of the time travel concept . A guardian angel travels back to the year 1728, with letters from 1997 and 1998. An unnamed man falls asleep and finds himself in a Paris of the future. Play - A good fairy sends people forward to the year 7603 AD. [1]
By the time of Augustus, the city grid encompassed an area of 10 km 2 (3.9 sq mi), [20] and the total population during the Roman principate was around 500,000–600,000, which would wax and wane in the course of the next four centuries under Roman rule.
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