For the number z=i^(i^i) can I take a log on both sides and write it as log(z)=i^i log(i)?

pleitatsj1

pleitatsj1

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2022-08-16

For the number
z = i i i
can I take a log on both sides and write it as log ( z ) = i i log ( i )?
I know that we can write log ( e i θ ) = i θ log ( e ), but I'm no sure if we can do that when the base is non real. Is this step valid for a non real base?

Answer & Explanation

Siena Bennett

Siena Bennett

Beginner2022-08-17Added 17 answers

I don't think that will work. But you could simplify is by using the definition from top to down. First, compute w = i i and then z = i w
By definition
i i = e i log ( i )
where log ( i ) = ln ( | i | ) + A r g ( i ) i = 1 2 π i. So we get w = i i = e 1 2 π . Next,
z = i w = e w log ( i ) = e 1 2 w π i = e i 1 2 π e 1 2 π .

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