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5 dage siden · An n × n square array of integers 1, 2, ..., n2 is called: Semi-magic square when its rows and columns sum to give the magic constant. Simple magic square when its rows, columns, and two diagonals sum to give magic constant and no more. They are also known as ordinary magic squares or normal magic squares.
2 dage siden · The Kilo-class submarines are a group of diesel-electric attack submarines designed by the Rubin Design Bureau [1] [2] [3] in the Soviet Union in the 1970s and built originally for the Soviet Navy . The first version had the Soviet designation Project 877 Paltus ( Russian: Па́лтус, meaning "halibut"), NATO reporting name Kilo.
3 dage siden · A Pythagorean triple has three positive integers a, b, and c, such that a2 + b2 = c2. In other words, a Pythagorean triple represents the lengths of the sides of a right triangle where all three sides have integer lengths. [1] Such a triple is commonly written (a, b, c).
2 dage siden · Five Paris Métro Lines (1, 4, 6, 11 and 14) run on a rubber tire system developed by the RATP in the 1950s, exported to the Montreal, Santiago, Mexico City and Lausanne metro. The number of cars in each train varies line by line. The shortest are lines 3bis and 7bis with three-car trains.
2 dage siden · Marathon world record progression. Kelvin Kiptum during his world record run at the 2023 Chicago marathon with 2:00:35. Mary Keitany during her women-only world record run at the 2017 London Marathon with 2:17:01. World records in the marathon are ratified by World Athletics, the international governing body for the sport of ...
3 dage siden · Samuel Langhorne Clemens (November 30, 1835 – April 21, 1910), [1] known by the pen name Mark Twain, was an American writer, humorist and essayist. He was praised as the "greatest humorist the United States has produced," [2] with William Faulkner calling him "the father of American literature ." [3] His novels include The Adventures of Tom ...
3 dage siden · Antoine Marie Jean-Baptiste Roger, comte de Saint-Exupéry, [3] known simply as Antoine de Saint-Exupéry ( UK: / ˌsæ̃tɪɡˈzuːpɛri /, [4] US: /- ɡzuːpeɪˈriː /, [5] French: [ɑ̃twan də sɛ̃t‿ɛɡzypeʁi]; 29 June 1900 – c. 31 July 1944), was a French writer, poet, journalist and aviator.