<?xml version="1.0"?>
<feed xmlns="http://www.w3.org/2005/Atom" xml:lang="de">
	<id>https://geometrie.idea-sketch.com/index.php?action=history&amp;feed=atom&amp;title=Nat%C3%BCrliche_Zahlen_mit_Multiplikation</id>
	<title>Natürliche Zahlen mit Multiplikation - Versionsgeschichte</title>
	<link rel="self" type="application/atom+xml" href="https://geometrie.idea-sketch.com/index.php?action=history&amp;feed=atom&amp;title=Nat%C3%BCrliche_Zahlen_mit_Multiplikation"/>
	<link rel="alternate" type="text/html" href="https://geometrie.idea-sketch.com/index.php?title=Nat%C3%BCrliche_Zahlen_mit_Multiplikation&amp;action=history"/>
	<updated>2026-07-07T08:08:12Z</updated>
	<subtitle>Versionsgeschichte dieser Seite in Geometrie-Wiki</subtitle>
	<generator>MediaWiki 1.43.9</generator>
	<entry>
		<id>https://geometrie.idea-sketch.com/index.php?title=Nat%C3%BCrliche_Zahlen_mit_Multiplikation&amp;diff=32189&amp;oldid=prev</id>
		<title>AndyWeber am 9. Juli 2018 um 17:37 Uhr</title>
		<link rel="alternate" type="text/html" href="https://geometrie.idea-sketch.com/index.php?title=Nat%C3%BCrliche_Zahlen_mit_Multiplikation&amp;diff=32189&amp;oldid=prev"/>
		<updated>2018-07-09T17:37:25Z</updated>

		<summary type="html">&lt;p&gt;&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;de&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Nächstältere Version&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Version vom 9. Juli 2018, 17:37 Uhr&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-l16&quot;&gt;Zeile 16:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Zeile 16:&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;(4) inverses Element&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;(4) inverses Element&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;Beispiel: &amp;lt;math&amp;gt; a=4, a&amp;lt;/math&amp;gt;&amp;lt;sup&amp;gt;-1&amp;lt;/sup&amp;gt;&amp;lt;math&amp;gt;=(1/4), a \sdot a&amp;lt;/math&amp;gt;&amp;lt;sup&amp;gt;-1&amp;lt;/sup&amp;gt;&amp;lt;math&amp;gt;=4 \sdot (1/4)=&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;0&lt;/del&gt;, a&amp;lt;/math&amp;gt;&amp;lt;sup&amp;gt;-1&amp;lt;/sup&amp;gt;&amp;lt;math&amp;gt; \notin \N &amp;lt;/math&amp;gt; &amp;lt;span style=&quot;color:red;&quot;&amp;gt;passt nicht!&amp;lt;/span&amp;gt;&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;Beispiel: &amp;lt;math&amp;gt; a=4, a&amp;lt;/math&amp;gt;&amp;lt;sup&amp;gt;-1&amp;lt;/sup&amp;gt;&amp;lt;math&amp;gt;=(1/4), a \sdot a&amp;lt;/math&amp;gt;&amp;lt;sup&amp;gt;-1&amp;lt;/sup&amp;gt;&amp;lt;math&amp;gt;=4 \sdot (1/4)=&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;1=e&lt;/ins&gt;, a&amp;lt;/math&amp;gt;&amp;lt;sup&amp;gt;-1&amp;lt;/sup&amp;gt;&amp;lt;math&amp;gt; \notin \N &amp;lt;/math&amp;gt; &amp;lt;span style=&quot;color:red;&quot;&amp;gt;passt nicht!&amp;lt;/span&amp;gt;&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;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;Somit handelt es sich bei &amp;lt;math&amp;gt;[\N,\sdot]&amp;lt;/math&amp;gt; nicht um eine Gruppe.&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;Somit handelt es sich bei &amp;lt;math&amp;gt;[\N,\sdot]&amp;lt;/math&amp;gt; nicht um eine Gruppe.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;

&lt;!-- diff cache key zum_geometrie:diff:1.41:old-32188:rev-32189:php=table --&gt;
&lt;/table&gt;</summary>
		<author><name>AndyWeber</name></author>
	</entry>
	<entry>
		<id>https://geometrie.idea-sketch.com/index.php?title=Nat%C3%BCrliche_Zahlen_mit_Multiplikation&amp;diff=32188&amp;oldid=prev</id>
		<title>AndyWeber am 9. Juli 2018 um 17:36 Uhr</title>
		<link rel="alternate" type="text/html" href="https://geometrie.idea-sketch.com/index.php?title=Nat%C3%BCrliche_Zahlen_mit_Multiplikation&amp;diff=32188&amp;oldid=prev"/>
		<updated>2018-07-09T17:36:44Z</updated>

		<summary type="html">&lt;p&gt;&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;de&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Nächstältere Version&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Version vom 9. Juli 2018, 17:36 Uhr&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-l12&quot;&gt;Zeile 12:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Zeile 12:&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;(3) neutrales Element&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;(3) neutrales Element&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;Beispiel: &amp;lt;math&amp;gt; a=4, &lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;n&lt;/del&gt;=1, a \sdot &lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;n&lt;/del&gt;=4 \sdot 1=4, &lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;n &lt;/del&gt;\in \N &amp;lt;/math&amp;gt; &amp;lt;span style=&quot;color:green;&quot;&amp;gt;passt.&amp;lt;/span&amp;gt;&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;Beispiel: &amp;lt;math&amp;gt; a=4, &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;e&lt;/ins&gt;=1, a \sdot &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;e&lt;/ins&gt;=4 \sdot 1=4, &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;e &lt;/ins&gt;\in \N &amp;lt;/math&amp;gt; &amp;lt;span style=&quot;color:green;&quot;&amp;gt;passt.&amp;lt;/span&amp;gt;&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;(4) inverses Element&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;(4) inverses Element&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;

&lt;!-- diff cache key zum_geometrie:diff:1.41:old-32187:rev-32188:php=table --&gt;
&lt;/table&gt;</summary>
		<author><name>AndyWeber</name></author>
	</entry>
	<entry>
		<id>https://geometrie.idea-sketch.com/index.php?title=Nat%C3%BCrliche_Zahlen_mit_Multiplikation&amp;diff=32187&amp;oldid=prev</id>
		<title>AndyWeber: Die Seite wurde neu angelegt: „Wir überprüfen ob es sich bei &lt;math&gt;[\N,\sdot]&lt;/math&gt; um eine Gruppe handelt:   (1) Abgeschlossenheit  Beispiel: &lt;math&gt; a=4, b=5, a \sdot b=4 \sdot 5=20 \in …“</title>
		<link rel="alternate" type="text/html" href="https://geometrie.idea-sketch.com/index.php?title=Nat%C3%BCrliche_Zahlen_mit_Multiplikation&amp;diff=32187&amp;oldid=prev"/>
		<updated>2018-07-09T17:35:42Z</updated>

		<summary type="html">&lt;p&gt;Die Seite wurde neu angelegt: „Wir überprüfen ob es sich bei &amp;lt;math&amp;gt;[\N,\sdot]&amp;lt;/math&amp;gt; um eine Gruppe handelt:   (1) Abgeschlossenheit  Beispiel: &amp;lt;math&amp;gt; a=4, b=5, a \sdot b=4 \sdot 5=20 \in …“&lt;/p&gt;
&lt;p&gt;&lt;b&gt;Neue Seite&lt;/b&gt;&lt;/p&gt;&lt;div&gt;Wir überprüfen ob es sich bei &amp;lt;math&amp;gt;[\N,\sdot]&amp;lt;/math&amp;gt; um eine Gruppe handelt:&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
(1) Abgeschlossenheit&lt;br /&gt;
&lt;br /&gt;
Beispiel: &amp;lt;math&amp;gt; a=4, b=5, a \sdot b=4 \sdot 5=20 \in \N &amp;lt;/math&amp;gt; &amp;lt;span style=&amp;quot;color:green;&amp;quot;&amp;gt;passt.&amp;lt;/span&amp;gt;&lt;br /&gt;
&lt;br /&gt;
(2) Assoziativität&lt;br /&gt;
&lt;br /&gt;
Beispiel: &amp;lt;math&amp;gt; a=3, b=2, c=4, (a \sdot b)\sdot c=(3 \sdot 2) \sdot 4=6 \sdot 4=24=3 \sdot 8=3 \sdot (2 \sdot 4)=a \sdot (b \sdot c) &amp;lt;/math&amp;gt; &amp;lt;span style=&amp;quot;color:green;&amp;quot;&amp;gt;passt.&amp;lt;/span&amp;gt;&lt;br /&gt;
&lt;br /&gt;
(3) neutrales Element&lt;br /&gt;
&lt;br /&gt;
Beispiel: &amp;lt;math&amp;gt; a=4, n=1, a \sdot n=4 \sdot 1=4, n \in \N &amp;lt;/math&amp;gt; &amp;lt;span style=&amp;quot;color:green;&amp;quot;&amp;gt;passt.&amp;lt;/span&amp;gt;&lt;br /&gt;
&lt;br /&gt;
(4) inverses Element&lt;br /&gt;
&lt;br /&gt;
Beispiel: &amp;lt;math&amp;gt; a=4, a&amp;lt;/math&amp;gt;&amp;lt;sup&amp;gt;-1&amp;lt;/sup&amp;gt;&amp;lt;math&amp;gt;=(1/4), a \sdot a&amp;lt;/math&amp;gt;&amp;lt;sup&amp;gt;-1&amp;lt;/sup&amp;gt;&amp;lt;math&amp;gt;=4 \sdot (1/4)=0, a&amp;lt;/math&amp;gt;&amp;lt;sup&amp;gt;-1&amp;lt;/sup&amp;gt;&amp;lt;math&amp;gt; \notin \N &amp;lt;/math&amp;gt; &amp;lt;span style=&amp;quot;color:red;&amp;quot;&amp;gt;passt nicht!&amp;lt;/span&amp;gt;&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
Somit handelt es sich bei &amp;lt;math&amp;gt;[\N,\sdot]&amp;lt;/math&amp;gt; nicht um eine Gruppe.&lt;/div&gt;</summary>
		<author><name>AndyWeber</name></author>
	</entry>
</feed>