An array of numbers or other mathematical functions multiplied according to certain rules
Functions to the real numbers can be added or multiplied by 
adding or... [DOC] [TLE] Guidelines and examples of array formulas - Excel - Office Support [PAR] Sum only numbers that meet certain conditions, such as the lowest values in a ... 
To multiply the values in the array (the cell range C2 through D11), select cells ... 
Rules for entering and changing array formulas .... Notice that Excel surrounds 
the formula with another set of braces, because you entered it as an array 
formula.