The phrase "an open question for" is correct and usable in written English.
It is used when you want to identify a particular question that is related to a certain subject or topic. For example: "An open question for further inquiry is whether the new policy has had an effect on poverty levels."
What Descartes actually intended by the words "soul" and "mind" seems to me an open question for Descartes himself.
While the former is an open question for the candidates, the second is not as America abandons its Iraqi friends.
It is an open question, for example, whether the system regulates itself to keep conditions comfortable for life, as Lovelock argues.
"Whether Oracle has enough depth of management is still an open question for investors," said James Pickeral, senior analyst at Chase H&Q in San Francisco.
Staying in business, after all, is very much an open question for any retail store in this sharp-elbowed retail environment.
It is an open question, for example, how many of the country's workers will be paid at all this month and what those wages will be worth if the rouble's slide continues.
If he follows through on his incredible promise – always an open question for Toronto – along with Bradley, Altidore and Cheyrou, TFC should have one of the more threatening midfields in MLS.
While the A.T.T. would not stop conflict overnight — and enforcement of its provisions, which is the responsibility of each ratifying country, is likely to remain an open question for years — it would most likely slow the spread of weapons that fuel conflicts and crime by making it harder for rogue regimes, rebel groups, terrorist organizations and criminals to get weapons.
At least Rangers fans can reasonably expect to have a team to cheer next season, which is very much an open question for the small but hardy band of Phoenix Coyotes faithful, writes Dan Bickley of The Arizona Republic after the Coyotes were swept out of the first round by the Red Wings.
During a recent review of the Australian Greens constitution, the issue of directly electing the party leader came up, and it's an open question for the party about whether the election of this key position continues to take place in the shadows, with a small group having a vote, or is conducted out in the open, with members participating.
It was an open question for almost four decades after Banach's fixed point theorem [1].
