"proven theory" is a correct and usable phrase in written English.
It is used to refer to a theory that has been confirmed with evidence or data. For example, "This new research supports the long-standing proven theory that climate change is caused by human activity."
The judges and UnLtd were impressed by the social impact produced by Blue Sky, and their proven theory of change.
Forthcoming films include "Dark Roots: The Anna Nicole Smith Story," an exploration of Ms. Smith's early life in Texas, for Showtime and "The Hidden Führer," which again considers the perpetually whispered (and never proven) theory that Hitler was gay, for HBO.
This section of the external carotid artery has never been implicated in migraine, and is therefore irrelevant in any discussion of Graham and Woolf's proven theory.
An adaptable, affordable, and sustainable wastewater treatment system powered by wind/solar energy is proposed based on proven theory and technology.
One hypothesis is a lack of Vitamin C in your dog's diet, but this is not a proven theory.
"Most nonprofits are not in the business of proving theory; they are in the business of improving outcomes.
He created the "salamandra robotica" as a way to prove theories about how a salamander makes its twisting course.
The ATSB said confirmation of the plotted course did not prove theories that the captain planned a deliberate murder-suicide.
To practical ends, quantum computers are being designed to prove theories far stranger than fiction, involving multiple universes and communication between molecules anywhere across space.
It also gets bigger over time, thereby proving theories about the danger of nanotechnology and the so-called "grey goo".
