improved comments; added all_eq, imp_eq (for blast); basic calculational rules;
improved comments;
added all_eq, imp_eq (for blast);
basic calculational rules;

MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle