The phrase "practically proven" is correct and usable in written English.
You can use it when referring to something that is nearly or nearly proven to be true. For example, "This theory has been practically proven through extensive research."
To Marion Keisker, his assistant, he had begun to talk increasingly about finding someone – and it had to be a white man, because the wall that he had run into with his recordings practically proved that in the present racial climate it couldn't be someone black – who might be able to bridge the gap.
However, several positive effects of engineered metal nanoparticles have been practically proved.
Numerous positive effects of engineered metal oxide nanoparticles have been practically proved (Table 2).
The described approaches are practically proved or work in progress as well as future work which shall be discussed on the workshop.
It is practically proved that this system can work stably, with fluctuation rate of water pressure no more than 2.0%, as well as good cutting quality and high production efficiency.
From error analysis and application results, it is both theoretically and practically proved that the proposed DLC method can reduce random forecasting errors while guaranteeing modelling accuracy, so that a more stable and precise system load forecasting result can be obtained.
Two examples — one recent, one practically ancient — prove the point.
While elegant, iso-response contour mapping has only proven practically useful with stimuli defined in two or three dimensions (Bölinger and Gollisch, 2012; Horwitz and Hass, 2012), whereas the current model operated on the full set of cone inputs to each RGC (typically 5 15 dimensions).
Žižka's system proved practically unbeatable.
The theoretical agreements between these governments quickly proved practically unenforceable, even though they were enough to disrupt the traditional transhumance of communities in the region.
