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# Html Codes: MathML- Summation and Production

When large amount of data is used, it is not make sense to write all of them in the equations and formulas; instead we use some Greek symbols to show the summation (Sigma) and production (Pi) for shortening the formula. So it is necessary to know how to write them in documents and specially web pages.
The following code shows HTML5 MathML structures for Summations and Productions. We have illustrated simple and complex examples below. So if you have large complicated equations which have fractions and other things inside summations and productions, don't worry and just follow the code below.