Getting Help

• Find All Defined Functions
• Find Help on a Function

Defining Functions

• Define a Function with Options
• Write a Function That Can Return Unevaluated
• Write a Function That Remembers Computed Values
• Set Up Error Checking and Messages in a Function
• Clear Definitions for Symbols and Functions

Using Contexts

• Automatically Use Separate Contexts for Different Notebooks

Variables

• Persist Values between Sessions
• Find the Underlying Tree Structure of an Expression
• Substitute Values of Variables in Functions That Hold Their Arguments