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Genaille–Lucas rulers (also known as Genaille's rods) are an arithmetic tool invented by Henri Genaille, a French railway engineer, in 1891. The device is a variant of Napier's bones. By representing the carry graphically, the user can read off the results of simple multiplication problems directly, with no intermediate mental calculations.
In this example, the rule says: multiply 3 by 2, getting 6. The sets {A, B, C} and {X, Y} in this example are disjoint sets, but that is not necessary.The number of ways to choose a member of {A, B, C}, and then to do so again, in effect choosing an ordered pair each of whose components are in {A, B, C}, is 3 × 3 = 9.
11 and 3 are written at the top; 11 is halved (5.5) and 3 is doubled (6). The fractional portion is discarded (5.5 becomes 5). 5 is halved (2.5) and 6 is doubled (12). The fractional portion is discarded (2.5 becomes 2). The figure in the left column (2) is even, so the figure in the right column (12) is discarded. 2 is halved (1) and 12 is ...
In 1991, he was convicted and sentenced to 3.5 to 7 years. [127] Goetz achieved celebrity status after the shooting. [128] [129] In 2001, he unsuccessfully ran for mayor of New York City; amongst other issues, Goetz advocated for a vegetarian menu in New York City schools, jails, and hospitals.
Henri Cohen (born 8 June 1947) is a number theorist, and an emeritus professor at the University of Bordeaux. He is best known for leading the team that created the PARI/GP computer algebra system. He also introduced the Rankin–Cohen bracket , co-proposed the Cohen-Lenstra heuristics and has written several textbooks in computational and ...
CodeHS was selected as one of three education technology companies to take part in the 2013 Innovation Challenge, part of the NBC Education Nation initiative. [6] Innovation Nation challenge participants CodeHS, Teachley, and GigaBryte participated in a series of challenges in October 2013, culminating in a live pitch contest broadcast live on NBC during the Education Nation Summit.
The cartridge was propelled by 47 gr (3.0 g) of cordite size 3 at a muzzle velocity of 2,150 ft/s (660 m/s). [12] In 1916 a tracer round was developed for the .577/450, the 295 gr (19.1 g) bullet comprised a cupronickel envelope containing 91 gr (5.9 g) of tracer element. The round was propelled by 40 to 50 gr (2.6 to 3.2 g) of cordite at a ...
Metcalf was co-author, with Ordway Tead, of Personnel administration: its principles and practice, generally considered to be the first college level textbook published on the discipline. [9] Tead and Metcalf explained that the purpose of this book was "to set forth the principles and the best prevailing practice in the field of the ...