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Grandi's series. In mathematics, the infinite series 1 − 1 + 1 − 1 + ⋯, also written. is sometimes called Grandi's series, after Italian mathematician, philosopher, and priest Guido Grandi, who gave a memorable treatment of the series in 1703. It is a divergent series, meaning that it does not have a sum. However, it can be manipulated to ...
The geometric series on the real line. In mathematics, the infinite series 1 2 + 1 4 + 1 8 + 1 16 + ··· is an elementary example of a geometric series that converges absolutely. The sum of the series is 1. In summation notation, this may be expressed as. The series is related to philosophical questions considered in antiquity, particularly ...
The Northrop X-21A was an experimental aircraft designed to test wings with laminar flow control. It was based on the Douglas WB-66D airframe, with the wing-mounted engines moved to the rear fuselage and making space for air compressors. The aircraft first flew on 18 April 1963 with NASA test pilot Jack Wells at the controls. [1]
2 1/2-dimensional manufacturing. 21⁄2-dimensional manufacturing, also known as 21⁄2-D, is a conventional way of describing a process for obtaining an object where the third dimension is somehow dependent from the transversal cross-section of the same. 21⁄2 -D is used for differentiating a 3D process, like for example injection moulding ...
X-1. X-1 (or SS X-1) [1] was a United States Navy Midget Submarine designed under project SCB 65. Laid down on 8 June 1954, at Deer Park, Long Island, New York, by the Engine Division of Fairchild Engine and Airplane Corporation. Launched on 7 September 1955, at Oyster Bay, Long Island, by Jakobson Shipyard. Delivered to the Navy on 6 October ...
Pilot familiarization. Gen. Ascani says he flew the X-1 in the "Fall of 1951". Most sources do not have a record of this flight. General Ascani's Form 5 was located a few years prior to his passing and the entry for his flight in the X-1 was 10 May 1950. XS-1 #157: October 23, 1951 Joseph Walker 46-063 NACA 54 ? ? Two ignition attempts. Engine ...
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