04/14/2011, 08:01 PM

04/14/2011, 08:10 PM

attention: h -> o is bad but yes h -> 0. because 'o' isn't number and is letter. lol

04/14/2011, 08:21 PM

(04/14/2011, 08:10 PM)nuninho1980 Wrote: [ -> ]attention: h -> o is bad but yes h -> 0. because 'o' isn't number and is letter. lol

no no, I put 0, but latex just designs it to look like o

04/14/2011, 10:14 PM

(04/14/2011, 08:01 PM)JmsNxn Wrote: [ -> ]I'm wondering if the following limit is non-zero; v E R

and if so, what is it equal to? Thanks

I know it doesn't converge for

The powers with non-integer exponents are not uniquely defined in the complex plane.

In your case you would need to put:

But then the standard logarithm has a cut on , which is quite arbitrary: one could put a cut however one likes. For example could spiral around 0, while moving towards 0 and would increase/decrease its imaginary part by in each round.

I guess it really depends on how approaches 0.

04/14/2011, 10:55 PM

let's take the limit from positive (keep it simple first)

so:

Is there any way of re-expressing this limit?

so:

Is there any way of re-expressing this limit?

04/15/2011, 07:14 AM

(04/14/2011, 10:55 PM)JmsNxn Wrote: [ -> ]let's take the limit from positive (keep it simple first)

so:

Is there any way of re-expressing this limit?

But then its not difficult, since on the reals, the whole limit goes to (complex) except for , for which the whole limit is 0.

04/15/2011, 05:09 PM

(04/15/2011, 07:14 AM)bo198214 Wrote: [ -> ]But then its not difficult, since on the reals, the whole limit goes to (complex) except for , for which the whole limit is 0.

Alright, how about

where is taken to mean approaching along the axis.

I think it's the equivalent of:

which I guess converges to negative infinity again, except for 1-e^{vi}=0

hmm, seems this is less interesting than I thought.

04/16/2011, 07:22 PM

is there any way of letting h approach zero such that:

?

?

04/16/2011, 07:41 PM

(04/16/2011, 07:22 PM)JmsNxn Wrote: [ -> ]is there any way of letting h approach zero such that:

?

The logarithm of is .

So regardless how you approach 0, i.e. , you will allways have that .

So the answer is no (except ).

04/16/2011, 07:48 PM

(04/16/2011, 07:41 PM)bo198214 Wrote: [ -> ]The logarithm of is .

So regardless how you approach 0, i.e. , you will allways have that .

So the answer is no (except ).

that's what I thought