product
<math xmlns="http://www.w3.org/1998/Math/MathML"> <apply> <product/> <bvar> <ci>x</ci> </bvar> <condition> <reln> <in/> <ci>x</ci> <ci type="set">B</ci> </reln> </condition> <apply> <fn> <ci>f</ci> </fn> <ci>x</ci> </apply> </apply> </math>
Author: Design Science, Inc. (E. Cannon, E. Tabacman, R.Miner)