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KevinM
Lv 7
KevinM fragte in Science & MathematicsMathematics · vor 7 Jahren

What are the complex solutions to e^x = 2x?

I know that this is related to the Lambert W() function, which is only defined on the range x >= -1/e, and that x = -W(-1/2) here.

http://www.wolframalpha.com/input/?i=e%5Ex+%3D+2x%...

However it seems that there is a system of equations that provides a complex solution to this equation. Does this only have a couple of solutions, or infinitely many? What do they look like?

http://www.wolframalpha.com/input/?i=e%5Ex+cos+y+%...

2 Antworten

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  • vor 7 Jahren

    Hello,

    Some inquiries about the Lambert function in Wikipedia would have yielded the answer:

       x = -W₀(-½)

    is the only real solution.

    This is the use of the W₀ branch of the Lambert function.

    The W₋₁ branch will yield a fully complex solution.

    So you will get at most two complex solutions, one of them being real.

    Regards,

    Dragon.Jade :-)

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