Two crucial biconditionals:

Biconditional 1: The speed of light is constant as per Einstein IF AND ONLY IF the wavelength of light is variable.

Biconditional 2: The speed of light is variable as per Newton IF AND ONLY IF the wavelength of light is constant for a given emitter.

Both biconditionals are immediate logical consequences of the formula

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

Both the antecedent and the consequent in Biconditional 2 are true (this claim should be justified of course). The consequent,

"the wavelength of light is constant for a given emitter",

will become the fundamental axiom of future, Einstein-free physics (the fundamental axiom of present, Einstein's physics is "the speed of light is constant", the antecedent in Biconditional 1).

Five important corollaries of the fundamental axiom of Einstein-free physics:

Corollary 1: Any frequency shift entails (is caused by) a proportional speed-of-light shift.

Corollary 2: 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, as per Newton's theory.

Corollary 3: Spacetime and gravitational waves (ripples in spacetime) don't exist. LIGO's "discoveries" are fakes.

Corollary 4: 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. Accordingly, there is no gravitational time dilation - Einstein's general relativity is nonsense.

Corollary 5: The Hubble redshift is due to light slowing down as it travels through vacuum. The universe is static, not expanding.

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