fact: Definition sq_fill_l_uniq {px1 : a01 = a11} {p0x : a00 = a01} {p1x : a10 = a11} {px0 : a00 = a10} (s : PathSquare px0 px1 p0x p1x) {px0' : a00 = a10} (s' : PathSquare px0' px1 p0x p1x) : px0 = px0'.
imports: Basics Types.Paths Types.Prod DPath