**TX Text Control** provides the TableCell.Formula property to define formulas for table cells and to
display the result of such calculations as cell text. The syntax of those formulas correlates mostly with the formula specification
in **SpreadsheetML** (Reference: Office Open XML File Formats - ISO/IEC 29500 - 1, Chapter: 18.17.2 Syntax) which is
also used by most spreadsheet applications such as Microsoft Excel.

A formula can consist of four elements: **functions**, **cell references**, **constants** and **operators**. The first three represent specific values inside the formula. Operators concatenate these elements and perform the corresponding calculation/operation.

The following example shows a sample formula containing a function, a cell reference, a constant and two operators:

**1. Constant:** 2 is a number constant.

**2. Operators:** '^' is the caret operator. It exponentiates the value of table cell R[-2]C[-1] with 2. The operator '*' multiplies the result of this calculation with Pi.

**3. Function:** PI() is a function that returns the value of Pi: 3.14159265.

**4. Cell Reference:** R[-2]C[-1] returns the value of the corresponding table cell (2 rows above and 1 column to the left from the formula's table cell).