Observer (receiver) starts moving towards the light source:
http://www.einstein-online.info/imag...ector_blue.gif
https://www.youtube.com/watch?v=bg7O4rtlwEE
The frequency and the speed of the light pulses, as measured by the moving observer, VARY PROPORTIONALLY; the wavelength (or distance between the pulses) is INVARIABLE.
This observation, generalized over all possible scenarios, will become The Fundamental Law of future, Einstein-free physics. Here is a deduction from the axioms (postulates):
Axiom 1: The wavelength of light is invariable.
Axiom 2: (frequency) = (speed of light)/(wavelength)
Conclusion (The Fundamental Law): Any frequency shift entails (is caused by) a proportional speed-of-light shift.
See more he
https://twitter.com/pentcho_valev
Pentcho Valev