Chapter 22 Open Problems and Future Mathematical Directions of Social Quantum Field Theory Corrections to Existing Equations Correction to Section 22.2 The observation equation should be written as \mathcal{H}_{\theta}\bigl(\Phi(t)\bigr) + \varepsilon(t). ] Here: (\mathcal{H}_{\theta}) is a parameter-dependent observation operator; (\theta) is a vector of unknown parameters; (\varepsilon(t)) represents measurement noise. Structural identifiability requires (\theta_2,\Phi_2). \tag{22.1} ] When gauge redundancy is present, equality should be interpreted modulo the relevant gauge group. Correction to Section 22.3 The invariance of expectation values should be shown explicitly: \langle U\Psi| U\hat{O}U^{\dagger} |U\Psi\rangle. ] Equivalently, \langle\Psi| U^{\dagger} \bigl(U\hat{O}U^{\dagger}\bigr) U |\Psi\rangle. ] The quotient model space is \mathcal{M}_{\mathrm{model}}/\mathcal{G}. \tag{22.3} ] Correction to Section 22.8 A time-dependent Hilbert-space formulation should read \math...