Exponential function: Difference between revisions

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Inverse of natural logarithm: exp(ln(-1)) = -1 is defined even if ln(-1) isn't. The complex-number definition ensures this identity.
Tag: Reverted
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\exp(\ln y)&=y
\end{align}</math>
for every [[real number]] <math>x</math> and every positive real number <math>y.</math>
 
===Power series===