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Do imaginary numbers in quantum mechanics do anything different than, say, a regular 3D coordinate system? Why do they show up in e.g the Schrödinger Equation? Is it because "i" can model waves and circular motion (e^i(pi) iirc)? If so, do complex and imaginary values do anything different than a sine or cosine function? Sorry if this sounds like alot, I'm just confused why imaginary quantities are showing up in physics.

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    $\begingroup$ Possible duplicates: physics.stackexchange.com/q/8062/2451 and links therein. $\endgroup$
    – Qmechanic
    Commented Nov 3, 2021 at 8:16
  • $\begingroup$ Imaginary numbers are about as imaginary as $e$ or $\pi$. It's very unfortunate nomenclature that we are stuck with for historical reasons. $\endgroup$
    – Prahar
    Commented Nov 3, 2021 at 9:54

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