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7998
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(*
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Experimental theory: long division of polynomials
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$Id$
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Author: Clemens Ballarin, started 23 June 1999
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*)
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16417
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theory LongDiv imports PolyHomo begin
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7998
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consts
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13735
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lcoeff :: "'a::ring up => 'a"
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14723
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eucl_size :: "'a::ring => nat"
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defs
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lcoeff_def: "lcoeff p == coeff p (deg p)"
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eucl_size_def: "eucl_size p == (if p = 0 then 0 else deg p+1)"
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lemma SUM_shrink_below_lemma:
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"!! f::(nat=>'a::ring). (ALL i. i < m --> f i = 0) -->
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setsum (%i. f (i+m)) {..d} = setsum f {..m+d}"
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apply (induct_tac d)
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15481
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apply (induct_tac m)
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apply (simp)
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apply (force)
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apply (simp add: ab_semigroup_add.add_commute[of m])
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14723
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done
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end
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