ActionScript for Flash MX: The Definitive Guide, 2nd Edition By Colin Moock
Chapter 18. ActionScript Language Reference
Number.POSITIVE_INFINITY Property
Flash 5
constant representing any number greater than Number.MAX_VALUE
read-only
Number.POSITIVE_INFINITY
Description
The POSITIVE_INFINITY property is provided for ECMA-262 compatibility. You should instead use its more convenient global property equivalent, Infinity.