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7 is the only number D for which the equation 2 n − D = x 2 has more than two solutions for n and x natural. In particular, the equation 2 n − 7 = x 2 is known as the Ramanujan–Nagell equation. 7 is one of seven numbers in the positive definite quadratic integer matrix representative of all odd numbers: {1, 3, 5, 7, 11, 15, 33}. [19] [20]
7 + 1; 6 + 2; 5 + 3; 5 + 2 + 1; 4 + 3 + 1; This is a general property. For each positive number, the number of partitions with odd parts equals the number of ...
An illustration of the complex plane. The imaginary numbers are on the vertical coordinate axis. Although the Greek mathematician and engineer Heron of Alexandria is noted as the first to present a calculation involving the square root of a negative number, [6] [7] it was Rafael Bombelli who first set down the rules for multiplication of complex numbers in 1572.
Paris Hilton is saying goodbye to her foster dog, Zuzu.. On Monday, Jan. 27, the DJ, 43, posted an Instagram video documenting the reunion between Zuzu and her owner, who lost their home in the ...
Broome has averaged 17.9 points and 10.7 rebounds per game this season. Auburn's win was part of a series of incredible matchups in the SEC on Tuesday night. No. 21 Ole Miss pulled off a road ...
You can save up to 70% on best-selling recliners during Presidents' Day sales events at retailers like Wayfair, Amazon, and Raymour & Flanigan.
The subtraction expression 7 – 5 is a different expression that doesn't represent the same operations, but it evaluates to the same result. Sometimes in elementary schools a number may be prefixed by a superscript minus sign or plus sign to explicitly distinguish negative and positive numbers as in [ 23 ]
WASHINGTON/HOUSTON (Reuters) -The United States on Friday imposed new sanctions on eight Venezuelan officials and increased to $25 million the reward it is offering for the arrest of President ...