das writes "Apple has introduced AirPort Express (specs), a palm-sized, portable 802.11g base station with 10/100 ethernet, USB printer sharing, and analog and optical audio output, for connection to a stereo system or powered speakers for streaming your music collection via 'AirTunes.' It supports multiple profiles for easy use at multiple locations It can plug directly into the wall as a "power brick", or use a longer power cord, similar to the newer PowerBook AC adapters. AirTunes requires iTunes 4.6, expected to be available soon."
We warn the reader in advance that the proof presented here depends on a
clever but highly unmotivated trick.
-- Howard Anton, "Elementary Linear Algebra"