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Natural logarithm/Real/Via exponential function/Definition
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Natural logarithm
The
natural logarithm
ln
:
R
+
⟶
R
,
x
⟼
ln
x
,
{\displaystyle \ln \colon \mathbb {R} _{+}\longrightarrow \mathbb {R} ,x\longmapsto \ln x,}
is defined as the
inverse function
of the
real exponential function
.