Does anyone know a deeper reason why the quantum mechanical wavefunction has to be complex? Is it to incorperate time dependence?(adsbygoogle = window.adsbygoogle || []).push({});

Or maybe the operator/eigenvector formulation is special and since it includes the scalar product, having complex variables is more general and necessary?

Or maybe the fact that there is some spin with its transformation means that wavefunction should be complex?

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# Why need *complex* wavefunction?

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