Definition upd_compact_sum {A} {F} (l: list A) (v: compact_sum (map F l)) (a: A) (v0: F a) (H: forall a b: A, {a = b} + {a <> b}) : compact_sum (map F l).Definition proj_compact_prod {A: Type} {F: A -> Type} (a: A) (l: list A) (v: compact_prod (map F l)) (default: F a) (H: forall a b: A, {a = b} + {a <> b}) : F a.Definition proj_compact_sum {A: Type} {F: A -> Type} (a: A) (l: list A) (v: compact_sum (map F l)) (default: F a) (H: forall a b: A, {a = b} + {a <> b}) : F a.Definition compact_sum_inj {A: Type} {F: A -> Type} {l: list A} (v: compact_sum (map F l)) (a: A) (H: forall a b: A, {a = b} + {a <> b}): Prop.

Lemma upd_compact_sum_JMeq: forall A i (l: list A) {F1: A -> Type} {F2: A -> Type} d1 d2 (v1: compact_sum (map F1 l)) (v2: compact_sum (map F2 l)) H, (forall i, In i l -> @eq Type (F1 i) (F2 i)) -> JMeq d1 d2 -> JMeq v1 v2 -> JMeq (upd_compact_sum l v1 i d1 H) (upd_compact_sum l v2 i d2 H).