removing conflicts
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@ -1286,11 +1286,11 @@ orbitals [see Eq.~\eqref{eq:RHF_orbs}] with $\theta_{\alpha}^{\text{RHF}} = \the
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%\begin{equation}
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% E_\text{HF}(0, 0) = \frac{1}{2} (2 U - 4 \epsilon).
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%\end{equation}
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With this representation, the parametrised RMP Hamiltonian becomes
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With this representation, the parametrised \hugh{atomic} RMP Hamiltonian becomes
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\begin{widetext}
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\begin{equation}
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\label{eq:H_RMP}
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\Tilde{\bH}_\text{RMP}\qty(\lambda) =
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\hugh{\bH_\text{atom}\qty(\lambda)} =
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\begin{pmatrix}
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2(U-\epsilon) - \lambda U & -\lambda t & -\lambda t & 0 \\
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-\lambda t & (U-\epsilon) - \lambda U & 0 & -\lambda t \\
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@ -1327,7 +1327,8 @@ In contrast, smaller $\epsilon$ gives a weaker attraction to the atomic site,
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representing strong screening of the nuclear attraction by core and valence electrons,
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and again a less negative $\lambda$ is required for ionisation to occur.
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Both of these factors are common in atoms on the right-hand side of the periodic table, \eg\ \ce{F},
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\ce{O}, \ce{Ne}, and thus molecules containing these atoms are often class $\beta$ systems with
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\ce{O}, \ce{Ne}.
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Molecules containing these atoms are therefore often class $\beta$ systems with
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a divergent RMP series due to the MP critical point. \cite{Goodson_2004,Sergeev_2006}
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% EXACT VERSUS APPROXIMATE
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@ -1375,13 +1376,12 @@ For $\lambda>1$, the HF potential becomes an attractive component in Stillinger'
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Hamiltonian displayed in Eq.~\eqref{eq:HamiltonianStillinger}, while the explicit electron-electron interaction
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becomes increasingly repulsive.
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\titou{Critical points along the positive real $\lambda$ axis for closed-shell molecules then represent
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points where the two-electron repulsion overcomes the attractive HF potential and an electron
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are successively expelled from the molecule.\cite{Sergeev_2006}}
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points where the two-electron repulsion overcomes the attractive HF potential
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and a single electron dissociates from the molecule.\cite{Sergeev_2006}}
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\titou{T2: I'd like to discuss that with you.}
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Symmetry-breaking in the UMP reference creates different HF potentials for the spin-up and spin-down electrons.
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Consider one of the two reference UHF solutions where the spin-up and spin-down electrons are localised on the left and
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right sites respectively.
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In contrast, symmetry-breaking in the UMP reference creates different HF potentials for the spin-up and spin-down electrons.
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Consider one of the two reference UHF solutions where the spin-up and spin-down electrons are localised on the left and right sites respectively.
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The spin-up HF potential will then be a repulsive interaction from the spin-down electron
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density that is centred around the right site (and vice-versa).
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As $\lambda$ becomes greater than 1 and the HF potentials become attractive, there will be a sudden
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