[b][color=#000000]Definition of the [/color][color=#0000ff]DOMAIN[/color][color=#000000] of a function: [/color][/b][br][br]The [color=#0000ff][b]DOMAIN[/b][/color] of a function of [color=#0000ff][b]the set of all its allowable input ([i]x[/i]) values.[/b][/color] [br][br]