摘要:
Let $\sum$ be a subset of $\mathbf{R}$ containing $0$ and $1$,the set $E(\sum)$ of all real numbers which are constructable from $\sum$ satisfies the ... 阅读全文
摘要:
Let $\sum$ be a subset of $\mathbf{R}$ containing $0$ and $1$,the set $E(\sum)$ of all real numbers which are constructable from $\sum$ satisfies the ... 阅读全文
摘要:
Definition 1.1.1.Let $\sum$ be a set of points in the plane $\mathbf{R}^2$. One saysthat a point $P$ is constructible with ruler and compass from $\su... 阅读全文
摘要:
Definition 1.1.1.Let $\sum$ be a set of points in the plane $\mathbf{R}^2$. One saysthat a point $P$ is constructible with ruler and compass from $\su... 阅读全文