If your business uses spreadsheets, you may find it necessary to count the number of cells containing data in a worksheet. You might also need to determine how many cells are empty or if the values of ...

Excel has over 475 formulas in its Functions Library, from simple mathematics to very complex statistical, logical, and engineering tasks such as IF statements (one of our perennial favorite stories); ...

A set is called a unique range set for a certain class of functions if each inverse image of that set uniquely determines a function from the given class. We show that a finite set is a unique range ...