In the book "when Einstein walked with Gödel" the author talks about Edwin A. Abotts "Flatland" stating that one problem which was unattended by Abott is the problem of acoustics in a world with an even number (in this case 2) of dimensions. He says that in spaces with an even number of dimensions a gunshot (or any "disturbance") will generate a system of waves that will reverberate forever. Can someone explain to me why that is?
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