Let x0 of type ο be given.
Apply H0 with
λ x1 . pack_e (setsum 1 x1) 0.
Let x1 of type ο be given.
Apply H1 with
λ x2 x3 x4 . lam (setsum 1 x2) (λ x5 . combine_funcs 1 x2 (λ x6 . 0) (λ x6 . Inj1 (ap x4 x6)) x5).
Let x2 of type ο be given.
Apply H2 with
λ x3 . lam x3 (λ x4 . Inj1 x4).
Let x3 of type ο be given.
Apply H3 with
λ x4 . lam (setsum 1 (ap x4 0)) (λ x5 . combine_funcs 1 (ap x4 0) (λ x6 . ap x4 1) (λ x6 . x6) x5).
Apply unknownprop_712520f713b96d5afd10321cea9a3c978868fc53aa35a29461e902d5b5a4ba79 with
λ x4 . True,
HomSet,
λ x4 . lam_id x4,
λ x4 x5 x6 x7 x8 . lam_comp x4 x7 x8,
struct_e,
PtdSetHom,
struct_id,
struct_comp,
λ x4 . pack_e (setsum 1 x4) 0,
λ x4 x5 x6 . lam (setsum 1 x4) (λ x7 . combine_funcs 1 x4 (λ x8 . 0) (λ x8 . Inj1 (ap ... ...)) ...),
...,
...,
...,
... leaving 5 subgoals.