Abstract
This comment is concerned with simple progressing solutions of the wave equation Square Operator phi =0. In flat spacetime, these were all found by Friedlander in 1946. It is shown that all of the cases he enumerated are special cases of a single progressing-wave solution in a plane-wave gravitational background. Finally, progressing waves are used to obtain a generalisation, to plane-wave spacetime, of Whittaker's formula (1903) for solutions of the wave equations in flat space.
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