%   ORIGINAL: 'h4/thm/rich_list/DROP_CONS_EL_'
% Assm: HL_TRUTH: T
% Assm: HL_FALSITY: ~F
% Assm: HL_BOOL_CASES: !t. (t <=> T) \/ (t <=> F)
% Assm: HL_EXT: !f g. (!x. f x = g x) ==> f = g
% Goal: !n l. 'h4/const/prim_rec/<' n ('h4/const/list/LENGTH' l) ==> 'h4/const/list/DROP' n l = 'h4/const/list/CONS' ('h4/const/list/EL' n l) ('h4/const/list/DROP' ('h4/const/num/SUC' n) l)
%   PROCESSED
% Assm ['HL_TRUTH']: T
% Assm ['HL_FALSITY']: ~F
% Assm ['HL_BOOL_CASES']: !t. (t <=> T) \/ (t <=> F)
% Assm ['HL_EXT']: !f g. (!x. happ f x = happ g x) ==> f = g
% Goal: !n l. 'h4/const/prim_rec/<' n ('h4/const/list/LENGTH' l) ==> 'h4/const/list/DROP' n l = 'h4/const/list/CONS' ('h4/const/list/EL' n l) ('h4/const/list/DROP' ('h4/const/num/SUC' n) l)
fof('HL_TRUTH', axiom, p(s(bool,'T'))).
fof('HL_FALSITY', axiom, ~ (p(s(bool,'F')))).
fof('HL_BOOL_CASES', axiom, ![T]: (s(bool,T) = s(bool,'T') | s(bool,T) = s(bool,'F'))).
fof('HL_EXT', axiom, ![V_3f57511,V_3f57507]: ![F, G]: (![X]: s(V_3f57507,happ(s(fun(V_3f57511,V_3f57507),F),s(V_3f57511,X))) = s(V_3f57507,happ(s(fun(V_3f57511,V_3f57507),G),s(V_3f57511,X))) => s(fun(V_3f57511,V_3f57507),F) = s(fun(V_3f57511,V_3f57507),G))).
fof('h4/thm/rich_list/DROP_CONS_EL_', conjecture, ![A]: ![N, L]: (p(s(bool,'h4/const/prim_rec/<'(s('h4/type/num/num',N),s('h4/type/num/num','h4/const/list/LENGTH'(s('h4/type/list/list'(A),L)))))) => s('h4/type/list/list'(A),'h4/const/list/DROP'(s('h4/type/num/num',N),s('h4/type/list/list'(A),L))) = s('h4/type/list/list'(A),'h4/const/list/CONS'(s(A,'h4/const/list/EL'(s('h4/type/num/num',N),s('h4/type/list/list'(A),L))),s('h4/type/list/list'(A),'h4/const/list/DROP'(s('h4/type/num/num','h4/const/num/SUC'(s('h4/type/num/num',N))),s('h4/type/list/list'(A),L))))))).
