fact: Definition istruncmap_plus_functor {n : trunc_index} {X Y : Type} (f : X -> Y) `{MapIn (Tr n.+1) _ _ f} (pc : PlusConnMap L O f) : MapIn (Tr n) (plus_functor L O f).
imports: HoTT.Basics HoTT.Types Extensions HFiber Truncations NullHomotopy Limits.Pullback Descent Lex Separated