%   ORIGINAL: 'h4/thm/rich_list/IS_SUBLIST_APPEND_'
% 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: !l1 l2. 'h4/const/rich_list/IS_SUBLIST' l1 l2 <=> (?l 'l\''. l1 = 'h4/const/list/APPEND' l ('h4/const/list/APPEND' l2 '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: !l1 l2. 'h4/const/rich_list/IS_SUBLIST' l1 l2 <=> (?l 'l\''. l1 = 'h4/const/list/APPEND' l ('h4/const/list/APPEND' l2 '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_3f52036,V_3f52032]: ![F, G]: (![X]: s(V_3f52032,happ(s(fun(V_3f52036,V_3f52032),F),s(V_3f52036,X))) = s(V_3f52032,happ(s(fun(V_3f52036,V_3f52032),G),s(V_3f52036,X))) => s(fun(V_3f52036,V_3f52032),F) = s(fun(V_3f52036,V_3f52032),G))).
fof('h4/thm/rich_list/IS_SUBLIST_APPEND_', conjecture, ![A]: ![L1, L2]: (p(s(bool,'h4/const/rich_list/IS_SUBLIST'(s('h4/type/list/list'(A),L1),s('h4/type/list/list'(A),L2)))) <=> ?[L, V_27l_5c_27_27]: s('h4/type/list/list'(A),L1) = s('h4/type/list/list'(A),'h4/const/list/APPEND'(s('h4/type/list/list'(A),L),s('h4/type/list/list'(A),'h4/const/list/APPEND'(s('h4/type/list/list'(A),L2),s('h4/type/list/list'(A),V_27l_5c_27_27))))))).
