Let $E$ an extension field of $k$ of grade $n$. I want to know if for $\alpha\in E$ the minimal polynomial of $\alpha$ has degree $r\leq n$. I think is true, but i could use some help
Answer
Conclude the desired result from the following:
Observation 1: Let $W$ be a subspace of a finite dimensional vector space $V$. Then $$\dim W \leq \dim V.$$
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