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	<id>https://www.k-wiki.kr/w/index.php?action=history&amp;feed=atom&amp;title=%ED%95%AD%EB%93%B1%EC%9B%90</id>
	<title>항등원 - 편집 역사</title>
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	<updated>2026-04-05T09:25:44Z</updated>
	<subtitle>이 문서의 편집 역사</subtitle>
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	<entry>
		<id>https://www.k-wiki.kr/w/index.php?title=%ED%95%AD%EB%93%B1%EC%9B%90&amp;diff=3118562&amp;oldid=prev</id>
		<title>옛@이름없는새끼: 생각해보니까 임의의 연산이 아니라 어떤 연산이었다</title>
		<link rel="alternate" type="text/html" href="https://www.k-wiki.kr/w/index.php?title=%ED%95%AD%EB%93%B1%EC%9B%90&amp;diff=3118562&amp;oldid=prev"/>
		<updated>2020-05-12T05:09:13Z</updated>

		<summary type="html">&lt;p&gt;생각해보니까 임의의 연산이 아니라 어떤 연산이었다&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;tr class=&quot;diff-title&quot; lang=&quot;ko&quot;&gt;
				&lt;td colspan=&quot;1&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← 이전 판&lt;/td&gt;
				&lt;td colspan=&quot;1&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;2020년 5월 12일 (화) 14:09 판&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-notice&quot; lang=&quot;ko&quot;&gt;&lt;div class=&quot;mw-diff-empty&quot;&gt;(차이 없음)&lt;/div&gt;
&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</summary>
		<author><name>옛@이름없는새끼</name></author>
	</entry>
	<entry>
		<id>https://www.k-wiki.kr/w/index.php?title=%ED%95%AD%EB%93%B1%EC%9B%90&amp;diff=120949&amp;oldid=prev</id>
		<title>옛@이름없는새끼: 생각해보니까 임의의 연산이 아니라 어떤 연산이었다</title>
		<link rel="alternate" type="text/html" href="https://www.k-wiki.kr/w/index.php?title=%ED%95%AD%EB%93%B1%EC%9B%90&amp;diff=120949&amp;oldid=prev"/>
		<updated>2020-05-12T05:09:13Z</updated>

		<summary type="html">&lt;p&gt;생각해보니까 임의의 연산이 아니라 어떤 연산이었다&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr class=&quot;diff-title&quot; lang=&quot;ko&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← 이전 판&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;2020년 5월 12일 (화) 14:09 판&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l3&quot;&gt;3번째 줄:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;3번째 줄:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==정의==&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==정의==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;임의의 &lt;/del&gt;연산 @와 임의의 수 a에 대해&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;어떤 &lt;/ins&gt;연산 @와 임의의 수 a에 대해&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;a @ x = x @ a = a를 만족하는 x를 연산 @의 항등원이라 한다.&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;a @ x = x @ a = a를 만족하는 x를 연산 @의 항등원이라 한다.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;

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&lt;/table&gt;</summary>
		<author><name>옛@이름없는새끼</name></author>
	</entry>
	<entry>
		<id>https://www.k-wiki.kr/w/index.php?title=%ED%95%AD%EB%93%B1%EC%9B%90&amp;diff=3118581&amp;oldid=prev</id>
		<title>옛@이름없는새끼: 새 문서: {{이과}}  ==정의==  임의의 연산 @와 임의의 수 a에 대해  a @ x = x @ a = a를 만족하는 x를 연산 @의 항등원이라 한다.  ==예시==  덧셈의 경우에는...</title>
		<link rel="alternate" type="text/html" href="https://www.k-wiki.kr/w/index.php?title=%ED%95%AD%EB%93%B1%EC%9B%90&amp;diff=3118581&amp;oldid=prev"/>
		<updated>2020-05-12T05:07:42Z</updated>

		<summary type="html">&lt;p&gt;새 문서: {{이과}}  ==정의==  임의의 연산 @와 임의의 수 a에 대해  a @ x = x @ a = a를 만족하는 x를 연산 @의 항등원이라 한다.  ==예시==  덧셈의 경우에는...&lt;/p&gt;
&lt;p&gt;&lt;b&gt;새 문서&lt;/b&gt;&lt;/p&gt;&lt;div&gt;{{이과}}&lt;br /&gt;
&lt;br /&gt;
==정의==&lt;br /&gt;
&lt;br /&gt;
임의의 연산 @와 임의의 수 a에 대해&lt;br /&gt;
&lt;br /&gt;
a @ x = x @ a = a를 만족하는 x를 연산 @의 항등원이라 한다.&lt;br /&gt;
&lt;br /&gt;
==예시==&lt;br /&gt;
&lt;br /&gt;
덧셈의 경우에는&lt;br /&gt;
&lt;br /&gt;
임의의 수 a에 대해&lt;br /&gt;
&lt;br /&gt;
a + 0 = 0 + a = a이기 때문에 덧셈의 항등원은 0이다.&lt;br /&gt;
&lt;br /&gt;
참고로 곱셈의 항등원은 1이다. 귀찮아서 증명은 생략.&lt;br /&gt;
&lt;br /&gt;
==관련 문서==&lt;br /&gt;
&lt;br /&gt;
* [[역원]]&lt;br /&gt;
&lt;br /&gt;
* [[수학]]&lt;/div&gt;</summary>
		<author><name>옛@이름없는새끼</name></author>
	</entry>
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