< Einheitskreis < Umklappen < Differenzierbar
Ist die Abbildung
φ
:
S
1
⟶
S
1
,
(
x
,
y
)
⟼
(
|
x
|
,
y
)
,
{\displaystyle \varphi \colon S^{1}\longrightarrow S^{1},\,(x,y)\longmapsto (\vert {x}\vert ,y),}
differenzierbar
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