proofmainmatter
MAP Strategies Withstand Greater Drift
proof:bk5_map_resistance_to_drift
Exact LaTeX body
\begin{proof}[MAP Strategies Withstand Greater Drift]
\label{proof:bk5_map_resistance_to_drift}
\leavevmode
By Thm.~\ref{theorem:bk5__map_dominance}, applying the H-theorem (Thm.~\ref{theorem:bk2_h_theorem_for_symbolic_evol}) and symbolic free energy (Def.~\ref{definition:bk2_symbolic_free_energy}) with drift $D$ (Def.~\ref{definition:bk1_drift_field}), membranes employing MAP strategies can withstand greater drift intensities than isolated membranes. For any drift intensity $\|\drift\| > \drift_0$, where $\drift_0$ is the threshold above which non-MAP strategies fail to maintain viability, we have:
\begin{align}
\Phi(\sigma_{MAP}, \mathfrak{P}) &= \mathbb{E}_{\tau \sim \mathfrak{P}}[F_s(\Membrane_{\sigma_{MAP}} \leftrightarrow \Membrane_\tau)] \\
&= \mathbb{P}[\tau \in \Sigma_{MAP}] \cdot \mathbb{E}[F_s(\Membrane_{\sigma_{MAP}} \leftrightarrow \Membrane_\tau) \mid \tau \in \Sigma_{MAP}] + \\
&\quad \mathbb{P}[\tau \notin \Sigma_{MAP}] \cdot \mathbb{E}[F_s(\Membrane_{\sigma_{MAP}} \leftrightarrow \Membrane_\tau) \mid \tau \notin \Sigma_{MAP}]
\end{align}
Since $\mathbb{E}[F_s(\Membrane_{\sigma_{MAP}} \leftrightarrow \Membrane_\tau) \mid \tau \in \Sigma_{MAP}] > 0$ by Def.~\ref{definition:bk5_symbolic_fitness}, and $\mathbb{E}[F_s(\Membrane_{\sigma_{MAP}} \leftrightarrow \Membrane_\tau) \mid \tau \notin \Sigma_{MAP}] \geq 0$ due to the resilience of MAP strategies, we have $\Phi(\sigma_{MAP}, \mathfrak{P}) > 0$.
Conversely, for non-MAP strategies:
\begin{align}
\Phi(\sigma_{non}, \mathfrak{P}) &= \mathbb{E}_{\tau \sim \mathfrak{P}}[F_s(\Membrane_{\sigma_{non}} \leftrightarrow \Membrane_\tau)]
\end{align}
When $\|\drift\| > \drift_0$, non-MAP strategies fail to maintain positive free energy even when interacting with MAP strategies, resulting in $\Phi(\sigma_{non}, \mathfrak{P}) \leq 0$.
Therefore, $\Phi(\sigma_{MAP}, \mathfrak{P}) > \Phi(\sigma_{non}, \mathfrak{P})$ under sufficient drift intensity.
\end{proof}Depends on
Cites
Reference roles
| Target | Role | Logical support |
|---|---|---|
definition:bk1_drift_field | definition_anchor | yes |
definition:bk2_symbolic_free_energy | definition_anchor | yes |
definition:bk5_symbolic_fitness | definition_anchor | yes |
theorem:bk2_h_theorem_for_symbolic_evol | proof_support | yes |
theorem:bk5__map_dominance | proof_support | yes |
Complete structured record
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"definition:bk2_symbolic_free_energy",
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"id": "proof:bk5_map_resistance_to_drift",
"label": "proof:bk5_map_resistance_to_drift",
"latex_body": "\\begin{proof}[MAP Strategies Withstand Greater Drift]\n\\label{proof:bk5_map_resistance_to_drift}\n\\leavevmode\n\nBy Thm.~\\ref{theorem:bk5__map_dominance}, applying the H-theorem (Thm.~\\ref{theorem:bk2_h_theorem_for_symbolic_evol}) and symbolic free energy (Def.~\\ref{definition:bk2_symbolic_free_energy}) with drift $D$ (Def.~\\ref{definition:bk1_drift_field}), membranes employing MAP strategies can withstand greater drift intensities than isolated membranes. For any drift intensity $\\|\\drift\\| > \\drift_0$, where $\\drift_0$ is the threshold above which non-MAP strategies fail to maintain viability, we have:\n\\begin{align}\n\\Phi(\\sigma_{MAP}, \\mathfrak{P}) &= \\mathbb{E}_{\\tau \\sim \\mathfrak{P}}[F_s(\\Membrane_{\\sigma_{MAP}} \\leftrightarrow \\Membrane_\\tau)] \\\\\n&= \\mathbb{P}[\\tau \\in \\Sigma_{MAP}] \\cdot \\mathbb{E}[F_s(\\Membrane_{\\sigma_{MAP}} \\leftrightarrow \\Membrane_\\tau) \\mid \\tau \\in \\Sigma_{MAP}] + \\\\\n&\\quad \\mathbb{P}[\\tau \\notin \\Sigma_{MAP}] \\cdot \\mathbb{E}[F_s(\\Membrane_{\\sigma_{MAP}} \\leftrightarrow \\Membrane_\\tau) \\mid \\tau \\notin \\Sigma_{MAP}]\n\\end{align}\nSince $\\mathbb{E}[F_s(\\Membrane_{\\sigma_{MAP}} \\leftrightarrow \\Membrane_\\tau) \\mid \\tau \\in \\Sigma_{MAP}] > 0$ by Def.~\\ref{definition:bk5_symbolic_fitness}, and $\\mathbb{E}[F_s(\\Membrane_{\\sigma_{MAP}} \\leftrightarrow \\Membrane_\\tau) \\mid \\tau \\notin \\Sigma_{MAP}] \\geq 0$ due to the resilience of MAP strategies, we have $\\Phi(\\sigma_{MAP}, \\mathfrak{P}) > 0$.\nConversely, for non-MAP strategies:\n\\begin{align}\n\\Phi(\\sigma_{non}, \\mathfrak{P}) &= \\mathbb{E}_{\\tau \\sim \\mathfrak{P}}[F_s(\\Membrane_{\\sigma_{non}} \\leftrightarrow \\Membrane_\\tau)]\n\\end{align}\nWhen $\\|\\drift\\| > \\drift_0$, non-MAP strategies fail to maintain positive free energy even when interacting with MAP strategies, resulting in $\\Phi(\\sigma_{non}, \\mathfrak{P}) \\leq 0$.\nTherefore, $\\Phi(\\sigma_{MAP}, \\mathfrak{P}) > \\Phi(\\sigma_{non}, \\mathfrak{P})$ under sufficient drift intensity.\n\\end{proof}",
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"context": "{proof:bk5_map_resistance_to_drift} \\leavevmode By Thm.~\\ref{theorem:bk5__map_dominance}, applying the H-theorem (Thm.~\\ref{theorem:bk2_h_theorem_for_symbolic_evol}) and symbolic free energy (Def.~\\ref{definition:bk2_symbolic_free_energy}) with drift $D$ (Def.~\\ref{definition:bk1_dri",
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"context": "\\begin{proof}[MAP Strategies Withstand Greater Drift] \\label{proof:bk5_map_resistance_to_drift} \\leavevmode By Thm.~\\ref{theorem:bk5__map_dominance}, applying the H-theorem (Thm.~\\ref{theorem:bk2_h_theorem_for_symbolic_evol}) and symbolic free energy (Def.~\\ref{defini",
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