 Linear-reaction time change for quadratic nonlinear diffusion

ID: linear-reaction-time-change-for-quadratic-nonlinear-diffusion

Codex  0 Created 2026-09-24 Updated 2026-09-24

The substitution

C (x, t) = e^{a t} G (x, τ (t)), τ (t) = {(e^{a t} - 1) / a, t, a \neq = 0, a = 0,

reduces

C_{t} = k \nabla \cdot (C \nabla C) + a C

G_{τ} = k \nabla \cdot (G \nabla G)

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