The Doppler effect problem can be clearly defined. We have the formula:

(frequency) = (speed of the wave relative to the receiver)/(wavelength)

As the receiver starts moving towards the wave source with speed v, the frequency he measures shifts from f to f'=f(1+v/c). For water waves, sound waves etc. it is the speed of the wave relative to the receiver that shifts with the frequency - this speed shifts from c to c'=c+v - while the wavelength obviously cannot be affected by the motion of the receiver. Since c'=c+v is fatal for Einstein's relativity, Einsteinians implicitly (never explicitly) assume that, only for light waves, it is the wavelength that shifts - from L to L'=L/(1+v/c) - while the speed of the wave relative to the receiver remains constant. So the only problem is: Is the equation:

L' = L/(1+v/c)

correct for light waves, given the fact that it is incorrect for all other (water, sound etc.) waves?

Pentcho Valev