English
If f is Antitone on s, ha IsLUB s a, hs Nonempty, and hb Tendsto f (nhdsWithin a) (nhds b), then IsGLB (f'' s) b.
Русский
Если f антитонична на s, ha — IsLUB s a, s непусто, и hb стремится к b по nhdsWithin a, тогда IsGLB (f'' s) b.
LaTeX
$$IsLUB.isLUB_of_tendsto (γ := γ^op) hf ha hs hb$$
Lean4
theorem isGLB_of_tendsto [Preorder γ] [TopologicalSpace γ] [OrderClosedTopology γ] {f : α → γ} {s : Set α} {a : α}
{b : γ} (hf : AntitoneOn f s) (ha : IsLUB s a) (hs : s.Nonempty) (hb : Tendsto f (𝓝[s] a) (𝓝 b)) :
IsGLB (f '' s) b :=
IsLUB.isLUB_of_tendsto (γ := γᵒᵈ) hf ha hs hb