subfield
/ˈsəb-ˌfēld/ (ame, mw)
subfield — noun
1. a particular area of study or research that forms a smaller, more focused part o
a particular area of study or research that forms a smaller, more focused part of a larger academic discipline — for example, bioinformatics is a subfield of biology, and behavioural economics is a subfield of economics.
Omar decided to specialise in astrophysics, a subfield of physics that studies stars and galaxies.
subfield + of + [broader field] for specialisation
Computational linguistics is a growing subfield that sits between computer science and language studies.
subfield described with 'growing' + preposition 'between'
The university is hiring three new professors for the subfield of environmental economics.
Each subfield of psychology, from child development to social behaviour, has its own research methods.
Several journals now focus exclusively on the subfield of marine conservation biology.
- specialty
more common in US English; often used for medical or professional fields rather than academic branches
- branch
broader and less formal; can refer to any division of knowledge or an organisation
- discipline
larger in scope than a subfield; a subfield belongs to a discipline
- field
the broader area that contains the subfield
文法句型
subfield + of + [broader field]
用法筆記
Often paired with 'within' or 'of' to name the larger discipline. The word implies a recognised, organised branch of study rather than a temporary research interest.
常見錯誤
2. a number system contained inside a larger number system (such as the rational nu
a number system contained inside a larger number system (such as the rational numbers inside the real numbers) and using the same addition and multiplication rules, while still obeying all the algebraic laws that define a field.
Professor Chen asked her algebra class to verify that the rational numbers are a subfield of the real numbers.
subfield + of + [set] + 'verify that' with that-clause
In algebra class, Yuki proved that the Gaussian integers are not a subfield of the complex numbers.
On the final exam, Aiko correctly stated that every field contains at least two subfields — itself and its prime subfield.
Piotr's thesis examined whether the set of constructible numbers forms a subfield of the real numbers under the usual operations.
During office hours, Leila sketched a diagram to show how the complex numbers contain the real numbers as a subfield.
文法句型
subfield + of + [mathematical field]
用法筆記
A strictly technical term in abstract algebra. The subfield must be closed under the same field operations as the larger field — it is not just any subset. Distinguish from a 'subring', which does not require multiplicative inverses.