The phrase "a definitive proof of" is correct and usable in written English.
It can be used when discussing evidence or arguments that conclusively establish a fact or theory.
Example: "The study provided a definitive proof of the theory that climate change is accelerated by human activity."
Alternatives: "a conclusive evidence of" or "an irrefutable proof of".
A definitive proof of this came from Fiji.
Dr. van der Klis said that the observations were "not a definitive proof" of the phenomenon but were just what astronomers expected if it were happening around the stars.
Actually, Kant belied his own professions at the time insofar as he thought himself in possession of a definitive proof of God's existence, which he explained in his essay Der einzig mögliche Beweisgrund zu einer Demonstration des Daseyns Gottes (1763; "The Only Possible Ground for a Demonstration of the Existence of God").
Then, we question the adaptive value of sleep traits by using non-coding DNA as a metaphor that shows that the complexity in the design is not a definitive proof of adaptation.
Disruption of the FC could bring a definitive proof of this model.
The use of surrogate markers as endpoints presents some study feasibility advantages [52], but improvement in a surrogate endpoint does not itself confer a definitive proof of patient benefit (i.e., a decrease in risk of AAA rupture) [53].
However, a more definitive proof of antioxidant benefit would have been required to measure plasma levels of the administered compounds.
Our study provides definitive proof-of-concept into the mechanism by which DENV evades immune recognition and activation in vivo.
We propose wide-spread sampling of ancestral C+ and C- forms of the S4 gene from a bacterial gene pool as a possible explanation, but definitive proof of such an ancient event cannot be easily obtained.
Even if a positive correlation were found, this would be a first step, not definitive proof of our concept.
For a fleeting moment, the special operators and intelligence people felt they had definitive proof of a link between a Kashmiri militant movement and the jihad in Iraq.
