mathlib documentation


List sections #

This file proves some stuff about list.sections (definition in data.list.defs). A section of a list of lists [l₁, ..., lₙ] is a list whose i-th element comes from the i-th list.

theorem list.mem_sections {α : Type u_1} {L : list (list α)} {f : list α} :
theorem list.mem_sections_length {α : Type u_1} {L : list (list α)} {f : list α} (h : f L.sections) :
theorem list.rel_sections {α : Type u_1} {β : Type u_2} {r : α → β → Prop} :