The observer (receiver) starts moving towards the light source and the frequency he measures increases (Doppler effect):

http://youtube.com/watch?v=bg7O4rtlwEE

We assume that the formula

(frequency measured by observer) = (speed of light relative to observer)/(wavelength)

is correct. Then the increase in frequency is accompanied by either

(A) increase in speed of light relative to observer; wavelength is invariable

or

(B) decrease in wavelength; speed of light relative to observer is invariable.

Clearly (A) is reasonable and (B) is idiotic. Here is an illustration of the idiocy (for sound waves):

https://pbs.twimg.com/media/DmkosMmWsAAyu8u.jpg

In future physics Einstein's false axiom

"Speed of light is invariable"

will be replaced with the correct axiom

"Wavelength of light is invariable".

So the formula

(frequency) = (speed of light)/(wavelength)

will mean that ANY frequency shift entails a speed-of-light shift.

Three valid (truthfulness of the premises guarantees truthfulness of the conclusion) arguments:

Premise 1: The wavelength of light is invariable.

Premise 2: The formula (frequency) = (speed of light)/(wavelength) is correct.

Conclusion 1: If the emitter and the observer (receiver) travel towards each other with relative speed v, the speed of light as measured by the observer is c' = c+v.

Conclusion 2: Light falls in a gravitational field with the same acceleration as ordinary falling bodies - near Earth's surface the accelerations of falling photons is g = 9.8 m/s^2. Gravitational time dilation does not exist - Einstein's general relativity is absurd.

Conclusion 3: The Hubble redshift is due to light slowing down as it travels through vacuum. The universe is STATIC, not expanding.

Pentcho Valev