Tachyons have complex mass, i.e. of the form, jm or im, depending on

whether you are a an engineer or a mathematician.

Have you ever heard of the time they put an engineer and a mathematician

on one side of a room, and a hot babe on the other, and said, "Here are

the rules. You can take as many steps as you wish to get across the room,

as quickly as you wish, but each step must be exactly half the length

of the previous step. Your first step is allowed to extend exactly half-

way across the room, and from there, take as many steps as you wish,

each being half as long as its predecessor."

The engineer is satisfied with this specification, strides across the

room, and scoops up the babe, while the mathematician is still doing

the series in his head. ;-)

Hint: "as many steps as you wish" includes infinity, if you wish. ;-P

It certainly approaches it as a limit, and we bump up against limits

annoyingly often, out here in real life. ;-)

Cheers!

Rich