Basic uniqueness for global integral curves of uniformly Lipschitz fields.
theorem
AVenhance.Infra.Flow.lipschitzWith_of_uniform_bound
(b : ℝ → Homogenization.Vec 2 → Homogenization.Vec 2)
{L : ℝ}
(hL : ∀ (t : ℝ) (x y : Homogenization.Vec 2), ‖b t x - b t y‖ ≤ L * ‖x - y‖)
(t : ℝ)
:
LipschitzWith ⟨max L 0, ⋯⟩ (b t)
A uniform spatial Lipschitz bound, stated with a real constant, gives a
nonnegative LipschitzWith constant for each time slice.
theorem
AVenhance.Infra.Flow.integralCurve_unique
(b : ℝ → Homogenization.Vec 2 → Homogenization.Vec 2)
{L : ℝ}
(hL : ∀ (t : ℝ) (x y : Homogenization.Vec 2), ‖b t x - b t y‖ ≤ L * ‖x - y‖)
{γ η : ℝ → Homogenization.Vec 2}
(hγ : ∀ (t : ℝ), HasDerivAt γ (b t (γ t)) t)
(hη : ∀ (t : ℝ), HasDerivAt η (b t (η t)) t)
{s : ℝ}
(h₀ : γ s = η s)
:
Two global integral curves with the same value at one time coincide.