The lower Lebesgue integral
Monotone convergence theorem -- somtimes called Beppo-Levi convergence.
See lintegral_supr_directed for a more general form.
Weaker version of the monotone convergence theorem
Monotone convergence theorem for nonincreasing sequences of functions
Known as Fatou's lemma
Dominated convergence theorem for nonnegative functions
Monotone convergence for a suprema over a directed family and indexed by an encodable type