## Linear Wave Equations-
*w*_{tt}=*a*^{2}*w*_{xx}. Wave equation. -
*w*_{tt}=*a*^{2}*w*_{xx}+ Φ(*x*,*t*). Nonhomogeneous wave equation. -
*w*_{tt}=*a*^{2}(*w*_{rr}+*r*^{−1}*w*_{r}) + Φ(*r*,*t*). Nonhomogeneous wave equation with axial symmetry. -
*w*_{tt}=*a*^{2}(*w*_{rr}+2*r*^{−1}*w*_{r}) + Φ(*r*,*t*). Nonhomogeneous wave equation with central symmetry.
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