removed redundant lemma, cf. class zero_neq_one in HOL/Rings.thy;
removed redundant lemma, cf. class zero_neq_one in HOL/Rings.thy;

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