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  <author_name>tmurata</author_name>
  <author_url>https://blog.hatena.ne.jp/tmurata/</author_url>
  <blog_title>tmurataの日記</blog_title>
  <blog_url>https://tmurata.hatenadiary.org/</blog_url>
  <categories>
    <anon>SICP</anon>
  </categories>
  <description>ゼロをまたがる区間で割った時、どういう状態になっているかというと、単純に 0 割りが発生するとか、上限下限が入れ替わるとか考えられるけど、一応試してみる。 X (10 ± 3), Y (0 ± 1) の場合 (div X Y) =&gt; (mul-interval X (make-interval (/ 1.0 (upper-bound Y)) (/ 1.0 (lower-boudn Y)))) =&gt; (mul-interval (10 ± 3) (make-interval (/ 1.0 (+ 0 1)) (/ 1.0 (- 0 1)))) =&gt; (let ((p1 (* (10 - 3) (/…</description>
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  <image_url></image_url>
  <provider_name>Hatena Blog</provider_name>
  <provider_url>https://hatena.blog</provider_url>
  <published>2009-05-07 08:47:58</published>
  <title>SICP問題2.10</title>
  <type>rich</type>
  <url>https://tmurata.hatenadiary.org/entry/20090507/1241653678</url>
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