The phrase 'topic of study' is correct and usable in written English.
You can use it to refer to the subject that is currently being studied or researched. For example, "This book offers an overview of the topic of study for my college course."
But the nature of the decree itself is not a topic of study within logic.
It did this by reversing my sense of Islam as a topic of study: rather abruptly, Islam seemed to be scrutinizing me.
As a topic of study, there are plenty of unresolved issues -- how much, say, Post-Minimalism was an American movement -- for scholars to cheerfully argue about.
National archives on the census The education team at the National Archives focus on the census as a topic of study.
The theft had elevated the from a topic of study for scholars to an indelible image in the popular consciousness.
At the same time, however, the role of bioethical experts on advisory or decision-making bodies has itself become a topic of study in bioethics.
Although there is still no agreement on this issue, the frontier between traditional religions and modern political ideologies remains a promising topic of study.
The role of the U.S. media in fostering and furthering this belief in North Vietnamese strength during that period has been a topic of study and argument.
Concerning a father and son who are rival professors at a university, the movie looks at how a scholar can devote his life to a single topic of study.
In the interest of fairness, I have to report that, as a student at Princeton in the mid-70's, I encountered Shapero's Symphony for Classical Orchestra in B-flat major as a topic of study in not one, but two courses, one taught by J. K. Randall and one by Milton Babbitt.
By the early '70s, the Holocaust had become a topic of study in universities, spurred in part by the rise of "ethnic studies" more generally and a surge of interest in Jewish history after Israel's dramatic military victory in the Israeli-Arab wars of 1967 and 1973.
