generalized proof by abstraction,
abstract propositional nnf goals (lets best_tac succeed on very large terms)
header {* Plain HOL *}
theory Plain
imports Datatype FunDef Record Extraction
begin
text {*
Plain bootstrap of fundamental HOL tools and packages; does not
include @{text Hilbert_Choice}.
*}
ML {* path_add "~~/src/HOL/Library" *}
end