Respected one, I want to know what the spherical means method is to solve a wave equation of two dimensions.
What is the spherical means method which is used in solving a wave equation of second order?
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pde
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0It seems to be explained [here](http://www.math.kth.se/~tkatchev/teaching/teaching_vt2009/lectures_uu/PDE09-07.pdf). – 2011-11-09