What is x^(3/5)?

On Wednesday, December 11, 2024 at 11:36:20 PM UTC+2 [email protected] 
wrote:

> If I put it as (x^2)^(1/5) it works fine.
>
>  
>
> *From:* [email protected] <[email protected]> *On Behalf Of *Paul 
> Royik
> *Sent:* Wednesday, December 11, 2024 8:15 PM
> *To:* sympy <[email protected]>
> *Subject:* [sympy] Real-valued root
>
>  
>
> I try to use the bridge between sympy and numpy, namely, the lambdify 
> function.
>
>  
>
> It looks ok, but there is an issue when I try to calculate the values of 
> x^(2/5) on the interval [-5,5]. 
>
>  
>
> Of course, for negative x, the value is nan, because, I guess, the root is 
> not real-valued.
>
> How to make it real-valued?
>
>  
>
> Thank you.
>
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