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Comment Sorry to say but.. (Score 1) 397

I've kinda wanted this for awhile, but only if you can authorise keys on other people's phones. Imagine you're at some huge music festival - how useful would it be if you could turn the service on and select your buddy from the list, then just walk round with an arrow pointing to which way they are and a distance meter.

Many of you won't appreciate the idea, but then you've probably never been to Glastonbury..

We warn the reader in advance that the proof presented here depends on a clever but highly unmotivated trick. -- Howard Anton, "Elementary Linear Algebra"