letin Xi ≝ (⌊n,≪xi n, Hxi n≫⌋);
letin Yi ≝ (⌊n,≪yi n, Hyi n≫⌋);
cases (restrict_uniform_convergence_uparrow ? S ? (H s) Xi x Hx);
letin Xi ≝ (⌊n,≪xi n, Hxi n≫⌋);
letin Yi ≝ (⌊n,≪yi n, Hyi n≫⌋);
cases (restrict_uniform_convergence_uparrow ? S ? (H s) Xi x Hx);