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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.
George A. Miller suggested that the capacity of the short-term memory storage is about seven items plus or minus two, also known as the magic number 7, [2] but this number has been shown to be subject to numerous variability, including the size, similarity, and other properties of the chunks. [3]
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]
That presentation, "The magical number seven, plus or minus two", was later published as a paper which went on to be a legendary one in cognitive psychology. [4] Miller moved back to Harvard as a tenured associate professor in 1955 and became a full professor in 1958, expanding his research into how language affects human cognition. [4]
The golden ratio φ and its negative reciprocal −φ −1 are the two roots of the quadratic polynomial x 2 − x − 1. The golden ratio's negative −φ and reciprocal φ −1 are the two roots of the quadratic polynomial x 2 + x − 1. The golden ratio is also an algebraic number and even an algebraic integer.
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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.
Figure 1. Plots of quadratic function y = ax 2 + bx + c, varying each coefficient separately while the other coefficients are fixed (at values a = 1, b = 0, c = 0). A quadratic equation whose coefficients are real numbers can have either zero, one, or two distinct real-valued solutions, also called roots.