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	<id>https://groupprops.subwiki.org/w/index.php?action=history&amp;feed=atom&amp;title=Join_of_abelian_subgroups_of_maximum_order</id>
	<title>Join of abelian subgroups of maximum order - Revision history</title>
	<link rel="self" type="application/atom+xml" href="https://groupprops.subwiki.org/w/index.php?action=history&amp;feed=atom&amp;title=Join_of_abelian_subgroups_of_maximum_order"/>
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	<updated>2026-06-23T03:25:54Z</updated>
	<subtitle>Revision history for this page on the wiki</subtitle>
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	<entry>
		<id>https://groupprops.subwiki.org/w/index.php?title=Join_of_abelian_subgroups_of_maximum_order&amp;diff=16849&amp;oldid=prev</id>
		<title>Vipul at 20:15, 2 March 2009</title>
		<link rel="alternate" type="text/html" href="https://groupprops.subwiki.org/w/index.php?title=Join_of_abelian_subgroups_of_maximum_order&amp;diff=16849&amp;oldid=prev"/>
		<updated>2009-03-02T20:15:50Z</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;
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				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 20:15, 2 March 2009&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;Line 3:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 3:&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;==Definition==&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;==Definition==&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;Let &amp;lt;math&amp;gt;P&amp;lt;/math&amp;gt; be a [[group of prime power order]]. The &#039;&#039;&#039;join of Abelian subgroups of maximum order&#039;&#039;&#039; in &amp;lt;math&amp;gt;P&amp;lt;/math&amp;gt;, sometimes denoted &amp;lt;math&amp;gt;J(P)&amp;lt;/math&amp;gt; and also termed the &#039;&#039;&#039;Thompson subgroup&#039;&#039;&#039;, is defined as the subgroup of &amp;lt;math&amp;gt;P&amp;lt;/math&amp;gt; generated by all [[defining ingredient::abelian subgroup of maximum order|abelian subgroups of maximum order]] in &amp;lt;math&amp;gt;P&amp;lt;/math&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;Let &amp;lt;math&amp;gt;P&amp;lt;/math&amp;gt; be a [[group of prime power order]]. The &#039;&#039;&#039;join of Abelian subgroups of maximum order&#039;&#039;&#039; in &amp;lt;math&amp;gt;P&amp;lt;/math&amp;gt;, sometimes denoted &amp;lt;math&amp;gt;J(P)&amp;lt;/math&amp;gt; and also termed the &#039;&#039;&#039;Thompson &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;subgroup&#039;&#039;&#039; or the &#039;&#039;&#039;Thompson J-&lt;/ins&gt;subgroup&#039;&#039;&#039;, is defined as the subgroup of &amp;lt;math&amp;gt;P&amp;lt;/math&amp;gt; generated by all [[defining ingredient::abelian subgroup of maximum order|abelian subgroups of maximum order]] in &amp;lt;math&amp;gt;P&amp;lt;/math&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;Note that the term &amp;#039;&amp;#039;Thompson subgroup&amp;#039;&amp;#039; is also used for the [[join of abelian subgroups of maximum rank]] and for the [[join of elementary abelian subgroups of maximum order]].&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;Note that the term &amp;#039;&amp;#039;Thompson subgroup&amp;#039;&amp;#039; is also used for the [[join of abelian subgroups of maximum rank]] and for the [[join of elementary abelian subgroups of maximum order]].&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&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;&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&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;===As a characteristic p-functor===&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&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;&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&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;For a nontrivial &amp;lt;math&amp;gt;p&amp;lt;/math&amp;gt;-group &amp;lt;math&amp;gt;P&amp;lt;/math&amp;gt;, the subgroup &amp;lt;math&amp;gt;J(P)&amp;lt;/math&amp;gt; is also nontrivial, since &amp;lt;math&amp;gt;P&amp;lt;/math&amp;gt; has nontrivial abelian subgroups. Thus, this is a [[characteristic p-functor]], and in particular, is a [[conjugacy functor]].  A closely related, and extremely important, &amp;lt;math&amp;gt;p&amp;lt;/math&amp;gt;-functor is the [[ZJ-functor]] whose many properties were explored by [[Glauberman]].&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Vipul</name></author>
	</entry>
	<entry>
		<id>https://groupprops.subwiki.org/w/index.php?title=Join_of_abelian_subgroups_of_maximum_order&amp;diff=15838&amp;oldid=prev</id>
		<title>Vipul at 22:43, 26 January 2009</title>
		<link rel="alternate" type="text/html" href="https://groupprops.subwiki.org/w/index.php?title=Join_of_abelian_subgroups_of_maximum_order&amp;diff=15838&amp;oldid=prev"/>
		<updated>2009-01-26T22:43:03Z</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;
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				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 22:43, 26 January 2009&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-l1&quot;&gt;Line 1:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 1:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&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;{{prime-parametrized subgroup-defining function}}&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&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;&lt;/ins&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;div&gt;==Definition==&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;==Definition==&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;/table&gt;</summary>
		<author><name>Vipul</name></author>
	</entry>
	<entry>
		<id>https://groupprops.subwiki.org/w/index.php?title=Join_of_abelian_subgroups_of_maximum_order&amp;diff=15836&amp;oldid=prev</id>
		<title>Vipul: New page: ==Definition==  Let &lt;math&gt;P&lt;/math&gt; be a group of prime power order. The &#039;&#039;&#039;join of Abelian subgroups of maximum order&#039;&#039;&#039; in &lt;math&gt;P&lt;/math&gt;, sometimes denoted &lt;math&gt;J(P)&lt;/math&gt; and also...</title>
		<link rel="alternate" type="text/html" href="https://groupprops.subwiki.org/w/index.php?title=Join_of_abelian_subgroups_of_maximum_order&amp;diff=15836&amp;oldid=prev"/>
		<updated>2009-01-26T21:32:20Z</updated>

		<summary type="html">&lt;p&gt;New page: ==Definition==  Let &amp;lt;math&amp;gt;P&amp;lt;/math&amp;gt; be a &lt;a href=&quot;/wiki/Group_of_prime_power_order&quot; title=&quot;Group of prime power order&quot;&gt;group of prime power order&lt;/a&gt;. The &amp;#039;&amp;#039;&amp;#039;join of Abelian subgroups of maximum order&amp;#039;&amp;#039;&amp;#039; in &amp;lt;math&amp;gt;P&amp;lt;/math&amp;gt;, sometimes denoted &amp;lt;math&amp;gt;J(P)&amp;lt;/math&amp;gt; and also...&lt;/p&gt;
&lt;p&gt;&lt;b&gt;New page&lt;/b&gt;&lt;/p&gt;&lt;div&gt;==Definition==&lt;br /&gt;
&lt;br /&gt;
Let &amp;lt;math&amp;gt;P&amp;lt;/math&amp;gt; be a [[group of prime power order]]. The &amp;#039;&amp;#039;&amp;#039;join of Abelian subgroups of maximum order&amp;#039;&amp;#039;&amp;#039; in &amp;lt;math&amp;gt;P&amp;lt;/math&amp;gt;, sometimes denoted &amp;lt;math&amp;gt;J(P)&amp;lt;/math&amp;gt; and also termed the &amp;#039;&amp;#039;&amp;#039;Thompson subgroup&amp;#039;&amp;#039;&amp;#039;, is defined as the subgroup of &amp;lt;math&amp;gt;P&amp;lt;/math&amp;gt; generated by all [[defining ingredient::abelian subgroup of maximum order|abelian subgroups of maximum order]] in &amp;lt;math&amp;gt;P&amp;lt;/math&amp;gt;.&lt;br /&gt;
&lt;br /&gt;
Note that the term &amp;#039;&amp;#039;Thompson subgroup&amp;#039;&amp;#039; is also used for the [[join of abelian subgroups of maximum rank]] and for the [[join of elementary abelian subgroups of maximum order]].&lt;/div&gt;</summary>
		<author><name>Vipul</name></author>
	</entry>
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