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(a) Standing waves are not exactly *propagating* disturbances, but still I
call them waves.
(c) I do _not_ like to use the word "wave" to describe solutions to the
diffusion equation. The don't propagate very well, but that doesn't settle
the issue, because of the previous two examples. Sigh. I suppose one
could consider them to be grossly overdamped waves, but that seems like
stretching a point.