Partial ordered set, Fixed point theorem, partially ordered sets, space of measurable functions, Space with measure, Space of measurable functions, fixed point theorems, 510, 004, Spaces of measurable functions (\(L^p\)-spaces, Orlicz spaces, Köthe function spaces, Lorentz spaces, rearrangement invariant spaces, ideal spaces, etc.), Fixed-point theorems, space with measure, Monotone and positive operators on ordered Banach spaces or other ordered topological vector spaces