Tue, 05 Jun 2007 18:36:07 +0200 wenzelm renamed locale ring/semiring to gb_ring/gb_semiring to avoid clash with Ring_and_Field versions;
Tue, 05 Jun 2007 17:16:41 +0200 huffman add new lemmas
Tue, 05 Jun 2007 16:32:16 +0200 chaieb Polynomials now only depend on Deriv; Definition of degree changed
Tue, 05 Jun 2007 16:31:10 +0200 chaieb lemma lemma_DERIV_subst moved to Deriv.thy
Tue, 05 Jun 2007 16:26:07 +0200 wenzelm tuned proofs;
Tue, 05 Jun 2007 16:26:06 +0200 wenzelm tuned comments;
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