(1) signatures updated according to normalizer_data.ML (added field ideal in entry); (2) For a theory the conversions returned are now ring_conv (as before, proves a universal statement), simple_ideal proves ideal membership for one polynomial ; multi_ideal solves the more general ideal membership for several existentially quantifier variables involved in several conjunctions; a simpset containing a simproc to turn x = y into p = 0 where p is the normal form of x - y;  (3) Added ideal_tac a tactic to prove general ideal membership (cf. John Harrision CADE 2007) ;  (4) Added algebra_tac : first tries ring_tac (old algebra) then ideal_tac
(1) signatures updated according to normalizer_data.ML (added field ideal in entry);
(2) For a theory the conversions returned are now ring_conv (as before, proves a universal statement), simple_ideal proves ideal membership for one polynomial ; multi_ideal solves the more general ideal membership for several existentially quantifier variables involved in several conjunctions; a simpset containing a simproc to turn x = y into p = 0 where p is the normal form of x - y;
 (3) Added ideal_tac a tactic to prove general ideal membership (cf. John Harrision CADE 2007) ;
 (4) Added algebra_tac : first tries ring_tac (old algebra) then ideal_tac

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