NEWS
changeset 30930 11010e5f18f0
parent 30855 c22436e6d350
child 30949 37f887b55e7f
     1.1 --- a/NEWS	Wed Apr 15 15:52:37 2009 +0200
     1.2 +++ b/NEWS	Thu Apr 16 10:11:34 2009 +0200
     1.3 @@ -1,6 +1,14 @@
     1.4  Isabelle NEWS -- history user-relevant changes
     1.5  ==============================================
     1.6  
     1.7 +*** HOL ***
     1.8 +
     1.9 +* Class semiring_div now requires no_zero_divisors and proof of div_mult_mult1;
    1.10 +theorems div_mult_mult1, div_mult_mult2, div_mult_mult1_if, div_mult_mult1 and
    1.11 +div_mult_mult2 have been generalized to class semiring_div, subsuming former
    1.12 +theorems zdiv_zmult_zmult1, zdiv_zmult_zmult1_if, zdiv_zmult_zmult1 and zdiv_zmult_zmult2.
    1.13 +div_mult_mult1 is now [simp] by default.  INCOMPATIBILITY.
    1.14 +
    1.15  New in Isabelle2009 (April 2009)
    1.16  --------------------------------
    1.17