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The imaginary unit in the momentum operator is not machinery pasted onto motion. It reveals the perpendicular mathematical dimension that makes motion possible. … readWhy Momentum Is Complex in Quantum Physics
Momentum is mass times velocity, and a real number cannot rotate a complex one — so momentum inherits velocity’s imaginary axis whole. Why the quantum momentum operator has an i in it, what the Born rule actually deletes, and exactly where the metaphor stops being true. … readMass Cannot Turn You