The phrase "a matter about which" is correct and usable in written English.
It can be used when discussing a specific topic or issue that requires attention or consideration.
Example: "There is a matter about which we need to have a serious discussion before making any decisions."
Alternatives: "a topic regarding" or "an issue concerning".
This is a matter about which we know very little.
This is a matter about which people have very strong views".
The culture of abuse online towards women, for example, is a matter about which one of us wrote a book.
He has Aids, a matter about which, by his own admission, he is uncharacteristically quiet, because he doesn't want others' impressions of him to be distorted by his disease.
If so he might have been reminded of something historically interesting, namely a matter about which the chancellor, who fancies himself as a historian, has not been straight with the public.
He has AIDS, a matter about which, by his own admission, he is uncharacteristically quiet, because he doesn't want others' impressions of him to be overwhelmed and distorted by his disease.
as the representative of the State before the Secretary of Transportation in any matter about which the Secretary is required to consult with or consider the views of a State authority under subpart II of this part.
Even if this argument is successful (a complicated matter about which there is considerable disagreement), it of course does not establish the more general claim that the concept of intrinsic goodness is not analyzable at all, since it leaves open the possibility that this concept is analyzable in terms of other concepts, some or all of which are not "natural" but evaluative.
Well, it could do and ultimately this is a contested empirical matter about which, as a mere philosopher, one ought not to claim to have an authoritative view.
We assume or pretend that if an indicative conditional has a false antecedent, there is a fact of the matter about which world would be actual if A were.
And likewise, if an owl desires a vole it seems that there is a fact of the matter about which of the counterpart states of affairs it is that would satisfy the owl's desire (and the counterpart to (3) seems most likely).
