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VosejProduct(Expression,jStart,jFinish,jIncrement,NonVolatile)
This function calculates the following expression:

for a certain function f(j).
Expression - the equation to be multiplied in string form, i.e. within " ", with the label j representing the integral variable
Jstart - the minimum value of j at which the product is to begin
Jfinish - the maximum value of j at which the product is to end
jIncrement -optional parameter (default = 1) that allows one to specify that the product is over non-integer increments of j.
NonVolatile - an optional recalculation mode parameter. If set to TRUE the function is evaluated only at the moment it is entered. If set to FALSE (default), the function is re-evaluated on each spreadsheet recalculation.