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  <author_name>lkozima</author_name>
  <author_url>https://blog.hatena.ne.jp/lkozima/</author_url>
  <blog_title>論理とか計算機とか数学とか</blog_title>
  <blog_url>https://lkozima.hatenablog.com/</blog_url>
  <categories>
  </categories>
  <description>今度は等式の証明でやってみました。append の結合性。 Coq &lt; Goal forall A (xs ys zs : list A), xs ++ ys ++ zs = (xs ++ ys) ++ zs. 1 subgoal ============================ forall (A : Type) (xs ys zs : list A), xs ++ ys ++ zs = (xs ++ ys) ++ zs induction をするに決まっている。 Unnamed_thm0 &lt; induction xs. 2 subgoals A : Type ===========…</description>
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  <image_url></image_url>
  <provider_name>Hatena Blog</provider_name>
  <provider_url>https://hatena.blog</provider_url>
  <published>2012-03-16 00:22:58</published>
  <title>Ltac と proof term 3</title>
  <type>rich</type>
  <url>https://lkozima.hatenablog.com/entry/2012/03/16/002258</url>
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