This instance will be upgraded to Heptapod 0.31.0 (final) on 2022-05-24 at 14:00 UTC+2 (a few minutes of down time)

Commit 00a2c359 authored by Lawrence Paulson's avatar Lawrence Paulson
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a slight streamlining

parent 6ada28be8b27
......@@ -375,21 +375,13 @@ next
by (auto simp: \<open>small A\<close> ordermap_mono_less)
have \<alpha>_sub: "elts \<alpha> \<subseteq> ordermap A VWF ` A"
by (metis \<open>small A\<close> elts_of_set less_eq_V_def ordertype_def ot replacement)
have g_less: "?g x < ?g y" if "x < y" "x \<in> elts \<alpha>" "y \<in> elts \<alpha>" for x y
proof -
have "?g x \<in> A" "?g y \<in> A"
using that by (meson \<alpha>_sub inv_into_into subsetD)+
moreover have "x \<in> ordermap A VWF ` A" "y \<in> ordermap A VWF ` A"
using \<alpha>_sub that by blast+
moreover have "A \<subseteq> ON"
using A_\<alpha>\<beta> elts_subset_ON \<open>Ord(\<alpha>*\<beta>)\<close> by blast
ultimately show ?thesis
by (metis ON_imp_Ord Ord_linear_lt f_inv_into_f less_not_sym om_A_less \<open>x < y\<close>)
have "?g \<in> elts \<alpha> \<rightarrow> elts (\<alpha> * \<beta>)"
have g: "?g \<in> elts \<alpha> \<rightarrow> elts (\<alpha> * \<beta>)"
by (meson A_\<alpha>\<beta> Pi_I' \<alpha>_sub inv_into_into subset_eq)
then have fg: "f \<circ> (\<lambda>X. ?g ` X) \<in> [elts \<alpha>]\<^bsup>2\<^esup> \<rightarrow> {..<2}"
by (rule nsets_compose_image_funcset [OF f _ inj_g])
have g_less: "?g x < ?g y" if "x < y" "x \<in> elts \<alpha>" "y \<in> elts \<alpha>" for x y
using Pi_mem [OF g]
by (meson A_\<alpha>\<beta> Ord_in_Ord Ord_not_le ord \<open>small A\<close> dual_order.trans elts_subset_ON inv_ordermap_VWF_mono_le ot that vsubsetD)
obtain i H where "i < 2" "H \<subseteq> elts \<alpha>"
and ot_eq: "tp H = [k,\<gamma>]!i" "(f \<circ> (\<lambda>X. ?g ` X)) ` (nsets H 2) \<subseteq> {i}"
using ii partn_lst_E [OF part fg] by (auto simp: eval_nat_numeral)
......@@ -411,12 +403,7 @@ next
have gH: "?g ` H \<subseteq> elts (\<alpha> * \<beta>)"
by (metis A_\<alpha>\<beta> \<alpha>_sub \<open>H \<subseteq> elts \<alpha>\<close> image_subsetI inv_into_into subset_eq)
have [simp]: "tp (?g ` H) = tp H"
proof (rule ordertype_VWF_inc_eq)
show "?g ` H \<subseteq> ON"
using elts_subset_ON gH ord(3) by auto
show "?g x < inv_into A (ordermap A VWF) y" if "x \<in> H" "y \<in> H" "x < y" for x y
using that \<open>H \<subseteq> elts \<alpha>\<close> g_less by blast
qed (use \<open>H \<subseteq> elts \<alpha>\<close> elts_subset_ON ord down in auto)
by (meson \<open>H \<subseteq> elts \<alpha>\<close> ord down dual_order.trans elts_subset_ON gH g_less ordertype_VWF_inc_eq subsetD)
show ?thesis
using ii [of "?g ` H"] ot_eq 1
apply (auto simp: gH elim!: nset_image_obtains)
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