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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 in 1956 in Psychological Review.
The Miller's law used in psychology is the observation, also by George Armitage Miller, that the number of objects the average person can hold in working memory is about seven. [4] It was put forward in a 1956 edition of Psychological Review in a paper titled "The Magical Number Seven, Plus or Minus Two". [5] [6] [7]
I'm not sure it's so irrelevant. It's just another name for the same concept. I actually knew the term 'hrair limit' (which is more concise anyway) than 'magical number seven plus or minus two.' joe conflo 20:37, 23 March 2008 (UTC) It isn't the same concept. 7+/-2 is an observed limitation strictly applicable to human short-term memory.
"The Magical Number Seven, Plus or Minus Two", a highly cited paper in psychology The "half-your-age-plus-seven" rule Rule of sevens , establishing age brackets for determining capacity to give informed assent or to commit crimes or torts
All rational numbers are real, but the converse is not true. Irrational numbers (): Real numbers that are not rational. Imaginary numbers: Numbers that equal the product of a real number and the imaginary unit , where =. The number 0 is both real and imaginary.
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Theorem — The number of strictly positive roots (counting multiplicity) of is equal to the number of sign changes in the coefficients of , minus a nonnegative even number. If b 0 > 0 {\displaystyle b_{0}>0} , then we can divide the polynomial by x b 0 {\displaystyle x^{b_{0}}} , which would not change its number of strictly positive roots.
The number seven was apparently the Egyptian symbol of such ideas as perfection, effectiveness, and completeness. Examples. Seven thousand barrels of red beer were used to trick Sekhmet out of killing. In her search for her husband's pieces, the goddess Isis was guarded by seven scorpions. A legendary famine lasted seven years.