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• Sigma notation
  ...eatly and compactly. Besides being easier to write than the explicit sum, sigma notation is also useful in that it shows the general form of each addend. ...is written ''under'' the sigma and the ''upper'' one is written above the sigma.
  2 KB (335 words) - 17:17, 8 February 2024
• 2002 IMO Shortlist Problems/A2
  Let <math>a_1, a_b, \ldots </math> be an infinite sequence of real numbers, for which there exists a real number <math>c </ma ...math>n </math> natural numbers such that <math> a_{\sigma(1)} , \ldots a_{\sigma(n)} </math> is an increasing sequence. Then we have
  3 KB (448 words) - 17:58, 20 August 2008
• Symmetric group
  ...h> be an element of <math>\mathfrak{S}_n</math>. One way to denote <math>\sigma</math> is as \sigma(1) & \sigma(2) & \cdots & \sigma(n) \end{pmatrix} </cmath>
  10 KB (1,668 words) - 15:33, 25 May 2008
• Mock AIME 1 2007-2008 Problems/Problem 6
  what the sigma ...l <math>r,c</math>, and so the summation will be, using the formula for an infinite [[geometric series]]:
  2 KB (288 words) - 17:35, 6 May 2024