Analytical expression fields define analytical functions—special types of mathematical functions. The following topics are covered in this section:

• “Building valid expressions,” Section 58.2.1

• “Overview of operations and functions in expressions,” Section 58.2.2

• “Evaluating expression fields,” Section 58.2.3

You can use expression fields in many prescribed conditions to define spatially varying parameters. For more information, see the following sections:

• “Using the interaction editors,” Section 15.13

• “Using the load editors,” Section 16.9

• “Using the boundary condition editors,” Section 16.10

• “Using the predefined field editors,” Section 16.11