True or false ? (In C ) z → 0 lim ( e z ) z 1 = e
Note.- We are using the exponentiaton complex, and not the multivalued function or multifunction " exp(z) " ,i.e, if h : C − { 0 } ⟶ C is the function h ( z ) = ( e z ) z 1 then z → 0 lim h ( z ) = e , is true or false ? Bonus.- what about z → 0 lim ( e z 1 ) z = e ?
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z → 0 lim ( e z ) z 1 = z → 0 lim ( 1 + z ) z 1 . Now, you have to apply the definition in exponentiation complex, i. e,this is a set a z = { e ( z ⋅ ( ln a ) ) } = { e ( z ⋅ ( ln ∣ a ∣ + i ⋅ arg(a) ) } , nevertheless, by agreement a z = e ( z ⋅ ( ln ∣ a ∣ + i ⋅ Arg(a) ) ) = e ( z ⋅ ( ln a ) ) , where Arg(a) ∈ ( − π , π ] , ∀ a ∈ C − { 0 }
Very good question... Sorry, I know I'm repeating my previous argument, , however, I've deleted my previous comment because I've achieved the bonus...
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( e z ∼ 1 + z , as z → 0 ), and ( ln ( 1 + z ) ∼ z , as z → 0 ), so z → 0 lim ( e z ) z 1 = z → 0 lim ( e z 1 ( ln ( 1 + z ) ) ) = z → 0 lim e ( z 1 ⋅ z ) = e What about the bonus ? Warning: You can't use my previous argument .
Bonus . z → 0 lim ( e z 1 ) z = z → ∞ lim ( e z ) z 1 This limit doesn't exist in C , because if R ∈ R , R > 0 , R → 0 + lim ( e R 1 ) R = R 1 → + ∞ lim ( e R ) R 1 = e , and taking i R , such that R ∈ R , R > 0 , R → 0 + lim ( e i R 1 ) i R = R → 0 + lim e i R ( i k ) = 1 due to k ∈ ( π , π ] and k is the main argument of e i R 1 , ( Arg e i R 1 ), ln e i R 1 = ln e R − i = ln 1 + i k