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The study of mathematics as a "demonstrative discipline" began in the 6th century BC with the Pythagoreans, who coined the term "mathematics" from the ancient Greek μάθημα (mathema), meaning "subject of instruction". [4] Greek mathematics greatly refined the methods (especially through the introduction of deductive reasoning and ...
Historically, the concept of a proof and its associated mathematical rigour first appeared in Greek mathematics, most notably in Euclid's Elements. [4] Since its beginning, mathematics was primarily divided into geometry and arithmetic (the manipulation of natural numbers and fractions), until the 16th and 17th centuries, when algebra [a] and ...
The event marked the first long-distance aeroplane race in England, the first take-off of a heavier-than-air machine at night, and the first powered flight into Manchester from outside the city. Paulhan repeated the journey in April 1950, the fortieth anniversary of the original flight, this time as a passenger aboard a British jet fighter.
The decimal number system in use today [3] was first recorded in Indian mathematics. [4] Indian mathematicians made early contributions to the study of the concept of zero as a number, [ 5 ] negative numbers , [ 6 ] arithmetic , and algebra . [ 7 ]
1972 – Vietnam War: For the first time since November 1967, American B-52 bombers reportedly begin bombing North Vietnam. 1973 – Invicta International Airlines Flight 435 crashes in a snowstorm on approach to Basel, Switzerland, killing 108 people. 1979 – Red River Valley tornado outbreak: A tornado lands in Wichita Falls, Texas killing ...
The first officer was Paul E. Oakes, a 40-year-old resident of Reno, Nevada, with 10,568 hours of experience, 595 on the 747. The flight engineer was Winfree Horne, who was 57 years old and from Los Altos, California, and had 23,569 hours of flight experience, 168 of them on the 747. The 34-year-old second officer, Wayne E. Sagar, was the ...
Kites are examples of ex-tangential quadrilaterals. Parallelograms (which include squares, rhombi, and rectangles) can be considered ex-tangential quadrilaterals with infinite exradius since they satisfy the characterizations in the next section, but the excircle cannot be tangent to both pairs of extensions of opposite sides (since they are parallel). [4]
Within the first approach the alleged stress–energy tensor must arise in the standard way from a "reasonable" matter distribution or non-gravitational field. In practice, this notion is pretty clear, especially if we restrict the admissible non-gravitational fields to the only one known in 1916, the electromagnetic field .