Woah
Woah
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This always baffled me. What does the proof for e^(ipi) = -1 even look like?
Write e^ix as an infinite series.
Then realize that that series is equivalent to the infinite series of cos(x) and isin(x) summed.
You end up with e^ix = cos(x) + isin(x)
Then plug in pi.
This isn't even true. It's derived from angles in a complex plane which is just autistic mememath
But it is
If you don't understand why complex waves are physically relevant and why this identity is important then you shouldn't be posting here
the exponential function for the complex numbers is redefined as the expansion sin/cos that everybody knows. It is said expanded because it fits with the usual definitions on the reals. So that is the "hack".
For references, see the first chapters of bak & newman complex analysis
Do complex exponentials mean that there is a solution to the equation "log a(b)=x" for all values of a and b?
no
>using incommensurable units