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## Main Question or Discussion Point

Hi.

I am looking for correct mathematical definition of longitudal wave im 3-D

if somebody will help me with some link or explanation it will be great.

Another thing: when I have a point source of waves i see that wavenumber changes from one point to point, is it wright?

thanx

I am looking for correct mathematical definition of longitudal wave im 3-D

if somebody will help me with some link or explanation it will be great.

Another thing: when I have a point source of waves i see that wavenumber changes from one point to point, is it wright?

thanx