| productGeneral 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 product symbol:
 $$\bigprod_{i=k}^{n}$$   gives     
 and $$\prod_{i=k}^{n}$$   gives  
 $$\LARGE\bigprod_{\tiny{i=k}}^{\tiny{n}}$$   gives     
 and $$\large\prod_{\small{i=k}}^{\small{n}}$$   gives  
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