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The Magical Number Seven, Plus or Minus Two. " The Magical Number Seven, Plus or Minus Two: Some Limits on Our Capacity for Processing Information " [1] is one of the most highly cited papers in psychology. [2] [3] [4] It was written by the cognitive psychologist George A. Miller of Harvard University 's Department of Psychology and published ...
7.63×25mm Mauser, which was the basis for, and has nearly identical dimensions to, the Tokarev, but has different loading specifications. 7.65×25mm Borchardt, from which both the Mauser and Parabellum cartridges were developed; 7.65×21mm Parabellum; 7.65×17mm Browning, also known as .32 ACP; 7.62mm SP-2, used only in the TKB-506 cigar ...
It is a variant of the Soviet-designed AK-47 (specifically Type 3 and AKM) assault rifles. Production started in 1956 at State Factory 66 but was eventually handed over to Norinco, who continues to manufacture the rifle, primarily for export. Norinco developed and produced 7.62×39mm ammunition for the Type 56 rifle.
The problem may be solved using simple addition. With 64 squares on a chessboard, if the number of grains doubles on successive squares, then the sum of grains on all 64 squares is: 1 + 2 + 4 + 8 + ... and so forth for the 64 squares. The total number of grains can be shown to be 2 64 −1 or 18,446,744,073,709,551,615 (eighteen quintillion ...
Power of two. A power of two is a number of the form 2n where n is an integer, that is, the result of exponentiation with number two as the base and integer n as the exponent . Powers of two with non-negative exponents are integers: 20 = 1, 21 = 2, and 2n is two multiplied by itself n times.
545 J (402 ft⋅lbf) The 7.63×25mm Mauser ( .30 Mauser Automatic) round is a bottleneck, rimless, centerfire cartridge, originally developed for the Mauser C96 service pistol. This cartridge headspaces on the shoulder of the case. [1] It later served as the basis for the 7.62mm Tokarev cartridge commonly used in Soviet and Eastern Bloc weapons.
63 is the sum of the first six powers of 2 (2 0 + 2 1 + ... 2 5). It is the eighth highly cototient number, and the fourth centered octahedral number after 7 and 25.
Most-perfect magic square when it is a pandiagonal magic square with two further properties (i) each 2×2 subsquare add to 1/k of the magic constant where n = 4k, and (ii) all pairs of integers distant n/2 along any diagonal (major or broken) are complementary (i.e. they sum to n 2 + 1).
637: 63 - 7 × 9 = 0. 14: It is divisible by 2 and by 7. 224: it is divisible by 2 and by 7. Add the last two digits to twice the rest. The result must be divisible by 14. 364: 3 × 2 + 64 = 70. 1,764: 17 × 2 + 64 = 98. 15: It is divisible by 3 and by 5. 390: it is divisible by 3 and by 5. 16
Septimal comma. 3-limit 9:8 major tone. 7-limit 8:7 septimal whole tone. A septimal comma is a small musical interval in just intonation that contains the number seven in its prime factorization. There is more than one such interval, so the term septimal comma is ambiguous, but it most commonly refers to the interval 64/63 (27.26 cents).