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# subfield

Let $F$ be a field and $S$ a subset of $F$ such that $S$ with the inherited operations from $F$ is also a field. Then we say that $S$ is a subfield of $F$.

The name ‘‘subfield’’ is used also in the case that $F$ is only a skew field and its subset $S$ forms a skew field.

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## Recent Activity

Sep 17

new question: numerical method (implicit) for nonlinear pde by roozbe

new question: Harshad Number by pspss

Sep 14

new problem: Geometry by parag

Aug 24

new question: Scheduling Algorithm by ncovella

new question: Scheduling Algorithm by ncovella

new question: numerical method (implicit) for nonlinear pde by roozbe

new question: Harshad Number by pspss

Sep 14

new problem: Geometry by parag

Aug 24

new question: Scheduling Algorithm by ncovella

new question: Scheduling Algorithm by ncovella