The phrase "from a theoretical" is grammatically correct and is commonly used in written English.
For example, "This paper looks at the issue of climate change from a theoretical perspective."
"I didn't come from a theoretical home," he says.
"To go from a theoretical idea to production is a large step," he said.
Far from a theoretical exercise, however, Jeanne Dielman has the gripping tension of a thriller.
From a theoretical point of view, we are faced with a classic collective-action problem.
'We know so much from a theoretical point of view,' says Lily.
NATO's new contingency plans involve Polish soldiers defending Lithuania from a (theoretical) Russian attack.
From a theoretical standpoint, it is possible to eliminate all pure risk if an infinitely large group is selected.
From a theoretical viewpoint, this assumption was sounded.
Finally, this methodology is consciously heterogeneous from a theoretical perspective.
The phenomenon has been described earlier from a theoretical standpoint.
From a theoretical point of view, his metaphysics is, in fact, incredibly rich and refined.
