%%-------------------** Abstract Reduction System (ARS) **------------------- %% %% Authors : Andre Luiz Galdino %% Universidade Federal de Goiás - Brasil %% %% and %% %% Mauricio Ayala Rincon %% Universidade de Brasília - Brasil %% %% Last Modified On: December 02, 2006 %% %%---------------------------------------------------------------------------
results_normal_form[T : TYPE] : THEORY BEGIN
IMPORTING results_confluence[T],
noetherian[T]
R : VAR PRED[[T, T]]
x, y, u, v : VAR T
%%--------------------** Basic Results: Normal Form **------------------------ %% %% %% - NF_doesnot_rewrite: If x is in normal form and x ->* y then x = y. %% %% %%%% If -> is confluent and x <->* y then %% %% - NF_implies_RTC: x ->* y if y is in normal form, %% %% - NFs_implies_Equal: x = y if both x and y are in normal form. %% %% %% - Norm_and_Confl_implies_UNF_NF: If -> is normalizing and confluent, %% every element has a unique normal form. %% %% %%%% If x has a unique normal form, the latter is denoted by x| %% %% - Normalizing_and_Confl: If -> is normalizing and confluent then x <->* y %% iff x| = y|. %% %% %% - Normal_Confl_iff_UNF: -> is normalizing and confluent iff %% every element has a unique normal form. %% %% %% - Noetherian_implies_normalizing: Any terminating relation is normalizing. %% %% %% - Convergent_UF: If -> is convergent, then every element has a unique %% normal form. %% %% %% - Noet_and_Confl_iff_UNF: If -> is terminating, then -> is confluent iff %% every element has a unique normal form. %% %% %% - Convergent_iff_eqNF: If -> is convergent, then x <->* y iff x| = y|. %% %% %%---------------------------------------------------------------------------
NF_doesnot_rewrite: LEMMA ( is_normal_form?(R)(x) & RTC(R)(x,y) => x = y )
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