sum (summation)

  • General syntax for symbols with a kind of lower and upper limits:

\symbolname_{lowerexpression}^{upperexpression}

  • In general, there are two ways how these lower and upper expressions can be placed: centered below and above the symbol or in a subscript / superscript manner. In the first case the symbol name is preceded by the word "big", in the second there is no prefix.
  • Syntax for summation symbol:

$$\bigsum_{i=k}^{n}$   gives   </p><p align="center">\bigsum_{i=k}^{n} </p><p align="center">and</p><p align="center">$$\sum_{i=k}^{n}$   gives 

\sum_{i=k}^{n}

  • Use font size commands for a nicer picture:

$$\LARGE\bigsum_{\small{i=1}}^{\small{n}}$   gives   </p><p></p><p align="center">\LARGE\bigsum_{\small{i=1}}^{\small{n}} </p><p align="left"></p><p align="center">and</p><p align="center">$$\large\sum_{\small{i=1}}^{\small{n}}$   gives 

\large\sum_{\small{i=1}}^{\small{n}}

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