Quot/QuotSum.thy
author Christian Urban <urbanc@in.tum.de>
Tue, 26 Jan 2010 00:18:48 +0100
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used the internal Option.map instead of custom option_map
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theory QuotSum
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imports QuotMain
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begin
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fun
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  sum_rel
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where
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  "sum_rel R1 R2 (Inl a1) (Inl b1) = R1 a1 b1"
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| "sum_rel R1 R2 (Inl a1) (Inr b2) = False"
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| "sum_rel R1 R2 (Inr a2) (Inl b1) = False"
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| "sum_rel R1 R2 (Inr a2) (Inr b2) = R2 a2 b2"
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fun
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  sum_map
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where
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  "sum_map f1 f2 (Inl a) = Inl (f1 a)"
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| "sum_map f1 f2 (Inr a) = Inr (f2 a)"
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declare [[map "+" = (sum_map, sum_rel)]]
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lemma sum_equivp[quot_equiv]:
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  assumes a: "equivp R1"
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  assumes b: "equivp R2"
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  shows "equivp (sum_rel R1 R2)"
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  apply(rule equivpI)
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  unfolding reflp_def symp_def transp_def
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  apply(auto)
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  apply(case_tac [!] x)
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  apply(simp_all add: equivp_reflp[OF a] equivp_reflp[OF b])
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  apply(case_tac [!] y)
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  apply(simp_all add: equivp_symp[OF a] equivp_symp[OF b])
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  apply(case_tac [!] z)
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  apply(simp_all)
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  apply(rule equivp_transp[OF a])
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  apply(assumption)+
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  apply(rule equivp_transp[OF b])
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  apply(assumption)+
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  done
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(*
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lemma sum_fun_fun:
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  assumes q1: "Quotient R1 Abs1 Rep1"
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  assumes q2: "Quotient R2 Abs2 Rep2"
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  shows  "sum_rel R1 R2 r s =
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          (sum_rel R1 R2 r r \<and> sum_rel R1 R2 s s \<and> sum_map Abs1 Abs2 r = sum_map Abs1 Abs2 s)"
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  using q1 q2
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  apply(case_tac r)
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  apply(case_tac s)
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  apply(simp_all)
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  prefer 2
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  apply(case_tac s)
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  apply(auto)
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  unfolding Quotient_def 
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  apply metis+
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  done
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*)
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lemma sum_quotient[quot_thm]:
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  assumes q1: "Quotient R1 Abs1 Rep1"
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  assumes q2: "Quotient R2 Abs2 Rep2"
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  shows "Quotient (sum_rel R1 R2) (sum_map Abs1 Abs2) (sum_map Rep1 Rep2)"
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  unfolding Quotient_def
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  apply(auto)
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  apply(case_tac a)
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  apply(simp_all add: Quotient_abs_rep[OF q1] Quotient_rel_rep[OF q1]
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                      Quotient_abs_rep[OF q2] Quotient_rel_rep[OF q2])
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  apply(case_tac a)
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  apply(simp_all add: Quotient_abs_rep[OF q1] Quotient_rel_rep[OF q1]
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                      Quotient_abs_rep[OF q2] Quotient_rel_rep[OF q2])
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  apply(case_tac [!] r)
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  apply(case_tac [!] s)
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  apply(simp_all)
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  using q1 q2
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  unfolding Quotient_def
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  apply(blast)+
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  done
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lemma sum_map_id[id_simps]: 
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  shows "sum_map id id \<equiv> id"
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  apply (rule eq_reflection)
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  apply (rule ext)
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  apply (case_tac x)
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  apply (auto)
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  done
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lemma sum_rel_eq[id_simps]: 
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  "sum_rel op = op = \<equiv> op ="
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  apply (rule eq_reflection)
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  apply (rule ext)+
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  apply (case_tac x)
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  apply auto
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  apply (case_tac xa)
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  apply auto
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  apply (case_tac xa)
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  apply auto
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  done
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end