The phrase "a focus or a" is not complete and lacks context, making it difficult to assess its correctness in written English.
It could be used in a context where options or alternatives are being discussed, particularly in relation to a focus or emphasis on a particular subject.
Example: "In our discussion, we need to determine whether we want a focus or a broader perspective on the issue at hand."
Alternatives: "an emphasis or a" or "a concentration or a".
Next to the fictional "Friday Night Lights" or the labor- and-time-intensive documentaries of Mr. Wiseman, "On Freddie Roach" is necessarily a modest, catch-as-catch-can affair, and through the first two episodes it doesn't have much of a focus or a narrative thread.
Note that is a saddle and is a node, a focus, or a center.
Thus, the equilibrium is a node, or a focus, or a center.
The fixed point can then be a focus or a center.
Recall that a critical point is said to be of focus-center type if it is either a focus or a center.
This situation corresponds to the case when the equilibrium point 0 of the autonomous homogeneous system x'= mathbf{A} x, (4) where A is supposed to be a regular constant matrix, is a center, a focus or a node.
It isn't just technology, or a STEM focus, or even a maker mindset; instead, the focus should be on how schools can help children realize they are not just consumers — they are designers, creators, makers and producers.
Therefore this result may reflect a stronger focus or even a possible isolation of members belonging to social groups from the rest of people they interact with.
Spinal epidural abscess may develop as a spread from a neighboring osteomyelitis focus or as a hematogenous spread from distant sites (usually skin or subcutaneous tissue) [7].
But it doesn't necessarily mean we're getting away from an artistic focus or a focus on the films themselves which are the main thing.
She lost because she could never find a language, a thematic focus, or a campaigning persona that could convince enough struggling working Americans that she, and not a cartoonish plutocrat, was their champion.
