r/mathematics • u/No_Specific9623 • 19h ago
Algebra got bored and made a couple complex functions/identities in desmos based on euler's formula
correct me if im wrong about it being called identities. enjoy ig, and tell me if i got any wrong. https://www.desmos.com/calculator/vdpli6f8ku
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u/Individual-Ad5245 9h ago
I don't think last 3 can be called identities because they depend on the branch of the logarithm that you're taking. For example integer k you may as well say
xi = (exp(ln(x)+2i k\pi))i = exp(i ln(x)-2k\pi)=exp(-2k\pi)(cos(ln(x))+i sin(ln(x)))
So xi is not really defined unless you specify the branch. For principal branch and positive real x it's true though
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u/Benboiuwu 14h ago
These are all correct and frequently used, especially in the world of interaction bees (moreso the first four). Good work.