"proven capable" is a perfectly valid, grammatically-correct expression in written English that can be used in many contexts.
For example, you could say "The new recruit was proven capable of handling the job responsibilities with skill and efficiency."
The Kurds have proven capable of establishing common cause with Arab tribes.
Lewis went on: "Conservatives should be worried that Walker hasn't proven capable of navigating these land mines".
Sexton says the area needs a moratorium on mining until technologies have been proven capable of mitigating pollutants.
It has proven capable of fulfilling its commitments, even in the face of intense internal and external provocations.
"From the streets of Iraqi cities to rural villages in Afghanistan, time and again women have proven capable of serving honorably and bravely.
If so, it is misguided; just after Drum is proven capable of fatherhood, Charlie again refers to his dog as "girl".
Syria's ongoing civil war has unexpectedly given rise to one of the most high-profile hacking groups to date, proven capable of influencing global politics.
He has consistently proven capable of getting production from the quarterback, whether it be Donovan McNabb, Michael Vick or to lesser extents Kevin Kolb and Nick Foles.
More importantly, the films were proven capable of operating in high-temperature systems by testing under different annealing temperatures.
In terms of therapeutic potential, unmodified muscle-derived stem cells have been proven capable of regenerating dystrophic muscle.
Homogeneous models cannot capture this rock failure mechanism while heterogeneous models are proven capable of capturing it.
