1.1 --- a/src/HOL/Library/Univ_Poly.thy	Tue Oct 09 21:33:12 2012 +0200
     1.2 +++ b/src/HOL/Library/Univ_Poly.thy	Tue Oct 09 22:24:24 2012 +0200
     1.3 @@ -414,7 +414,6 @@
     1.4  apply (auto simp add: poly_exp poly_mult)
     1.5  done
     1.6  
     1.7 -lemma (in semiring_1) one_neq_zero[simp]: "1 \<noteq> 0" using zero_neq_one by blast
     1.8  lemma (in comm_ring_1) poly_prime_eq_zero[simp]: "poly [a,1] \<noteq> poly []"
     1.9  apply (simp add: fun_eq)
    1.10  apply (rule_tac x = "minus one a" in exI)