鐃緒申鐃緒申鐃緒申鐃緒申鐃� II 鐃緒申鐃緒申 No.1

$\fbox{本講義の目的}$

鐃塾わ申鐃緒申鐃緒申鐃塾器申鐃旬わ申鐃緒申鐃緒申鐃緒申鐃重�申文鐃緒申呂鐃緒申薐居申發刻申襦� 鐃緒申鐃緒申鐃� II 鐃祝わ申鐃緒申鐃銃は醐申密鐃緒申鐃熟常申鐃緒申鐃庶し鐃銃わ申鐃緒申鐃緒申鐃重�常申僂鐃� 鐃夙につわ申鐃緒申鐃夙わ申櫃箸鐃緒申討鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃宿は常申鐃緒申鐃駿わ申鐃緒申鐃夙わ申鐃緒申鐃殉わ申鐃緒申鐃春わ申鐃緒申鐃緒申鐃緒申

鐃緒申鐃緒申鐃塾テ￥申鐃緒申:

鐃緒申鐃緒申 $z\to z^2$ .

複鐃叔随申鐃緒申 ${\Bbb C}$ 鐃緒申鐃初そ鐃曙自鐃夙への種申鐃緒申 $f:z\mapsto z^2$ 鐃緒申佑鐃緒申茲�申鐃� 鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃�II鐃叔わ申辰鐃緒申茲�申法鐃緒申鐃緒申亮鐃緒申鐃緒申砲牢捗鐃銃縁申鐃�

$\begin{displaymath}\phi:{\Bbb C}[X]\to {\Bbb C}[X] : \phi(f(X))=f(X^2) \end{displaymath}$

鐃緒申鐃出縁申鐃緒申鐃銃わ申鐃暑。 $(f={}^a\phi)$ . 鐃旬講居申鐃叔は￥申鐃緒申鐃塾環緒申同鐃緒申鐃緒申鐃緒申 ${\Bbb C}(X)$ 鐃緒申鐃初そ鐃曙自鐃夙への緒申同鐃緒申鐃祝鰹申張鐃緒申鐃銃わ申鐃緒申鐃緒申鐃緒申鐃薯見わ申鐃緒申鐃塾でわ申鐃暑が鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申

鐃緒申鐃緒申鐃緒申鐃祝つわ申鐃銃わ申鐃緒申鐃縦わ申鐃緒申鐃春わ申鐃銃わ申鐃緒申鐃緒申鐃緒申鐃緒申

鐃緒申鐃緒申 1.1

1.: 鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃祝写わ申鐃緒申
2.: 鐃緒申鐃緒申鐃淑鰹申鐃叔は￥申鐃緒申2:1鐃塾種申鐃緒申鐃叔わ申鐃暑。
3.: 鐃宿わ申鐃熟�鰹申鐃緒申鐃� $g:{\Bbb C}\to {\Bbb C}$ 鐃緒申鐃緒申辰討鐃緒申討癲� $f\circ g=id$ 鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃夙わ申鐃峻駕申能鐃叔わ申鐃暑。

鐃緒申鐃緒申鐃緒申鐃緒申虜埜鐃塾種申張鐃熟￥申

鐃緒申平鐃緒申鐃緒申鐃緒申箸鐃夙わ申鐃緒申鐃緒申鐃夙わ申鐃春鰹申鐃緒申鐃書しわ申鐃緒申鐃叔わ申鐃暑こ鐃夙を示わ申鐃銃わ申鐃暑。

平鐃緒申鐃緒申鐃緒申鐃緒申鐃暑い鐃熟わ申辰醗鐃緒申未鐃緒申鐃緒申鐃緒申鐃緒申虜鐃緒申鐃緒申鐃旬わ申鐃緒申調鐃駿るた鐃緒申鐃� 鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃暑ガ鐃緒申鐃緒申鐃緒申鐃緒申鐃叔わ申鐃暑。鐃緒申鐃塾講居申鐃叔わ申鐃緒申鐃緒申鐃銃わ申鐃緒申鐃初か鐃祝わ申鐃暑こ鐃夙はでわ申鐃淑わ申鐃緒申鐃緒申鐃緒申鐃緒申鐃縦わ申鐃緒申鐃緒申鐃祝つわ申鐃銃わ申鐃緒申鐃盾す鐃緒申予鐃緒申任鐃緒申襦�

鐃緒申鐃緒申 1.1 $z\mapsto z^3$ 鐃淑わ申複鐃緒申平鐃緒申 ${\Bbb C}$ 鐃緒申鐃初そ鐃曙自鐃夙への種申鐃緒申鐃緒申鐃宿わ申鐃緒申鐃緒申鐃宿のよう鐃祝移るか鐃緒申鐃緒申鐃春わ申鐃淑わ申鐃緒申渕鐃緒申鐃緒申茵� (鐃瞬居申鐃緒申鐃緒申鐃緒申鐃緒申鐃塾は講居申鐃緒申 $z\mapsto z^2$ 鐃塾図種申鐃薯参考にわ申鐃暑こ鐃夙￥申鐃峻刻申鐃祝わ申鐃銃ｏ申鐃緒申鐃旬の講居申鐃緒申鐃緒申覆鐃緒申鐃緒申鐃緒申砲麓鐃淑�申覆鐃祝刻申鐃竣わ申鐃銃みるこ鐃夙￥申)

2001-10-02