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
Undid revision 1295921430 by 2600:1700:A410:C4E0:A48F:F30C:4B6E:7354 (talk) There are ways to make that true, but there are also ways to make that false. Unless we add some verbiage to distinguish the cases, we should stay away from that quagmire
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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===