Main Page | See live article | Alphabetical index In abstract algebra a subfield is a subset of a field which, together with the additive and multiplicative operators restricted to it, is a field in its own right. If K is a subfield of L, then L is said to be a field extension of K: see the latter article. This article is a stub. You can help Wikipedia by fixing it. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.