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True / False
A wave equation for quantum mechanics must preserve superposition: if ψ1\psi_1 and ψ2\psi_2 are valid states, then c1ψ1+c2ψ2c_1\psi_1 + c_2\psi_2 must also be a valid state. True or false: this requirement forces the equation governing ψ\psi to be linear.