Friston KL-Gaussian: F=log(σ_p/σ_q)−1/2+(μ_q²+σ_q²)/(2σ_p²); F=0 at prior=posterior

Layer 3 — Biologyin the systems-neuroscience subtree

Sympy-exact symbolic witness of the Friston free-energy Gaussian-KL canonical form, prior-posterior-match anchor, and Gaussian-entropy pin. Setup: mu_q, sigma_q, sigma_p — all positive symbols. Gaussian-Gaussian KL-divergence: KL[N(μ_q,…

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