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	<id>https://gradwiki.math.ucr.edu/index.php?action=history&amp;feed=atom&amp;title=2.1</id>
	<title>2.1 - Revision history</title>
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	<updated>2026-04-20T17:18:21Z</updated>
	<subtitle>Revision history for this page on the wiki</subtitle>
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	<entry>
		<id>https://gradwiki.math.ucr.edu/index.php?title=2.1&amp;diff=263&amp;oldid=prev</id>
		<title>Tim Cobler at 05:13, 30 March 2015</title>
		<link rel="alternate" type="text/html" href="https://gradwiki.math.ucr.edu/index.php?title=2.1&amp;diff=263&amp;oldid=prev"/>
		<updated>2015-03-30T05:13:08Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left diff-editfont-monospace&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;
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				&lt;tr class=&quot;diff-title&quot; lang=&quot;en&quot;&gt;
				&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 05:13, 30 March 2015&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-l4&quot; &gt;Line 4:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 4:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&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;You can only add two matrices of the same dimensions. If the matrices are of different dimensions then the sum is not defined.  &lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&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;You can only add two matrices of the same dimensions. If the matrices are of different dimensions then the sum is not defined.  &lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&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;/td&gt;&lt;td class='diff-marker'&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;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&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;&amp;lt;math&amp;gt;\begin{bmatrix} 1 &amp;amp; 2 &amp;amp; 3 \\ 4 &amp;amp; 5 &amp;amp; 6 \\ 7 &amp;amp; 8 &amp;amp; 9\end{bmatrix} + \begin{bmatrix} 1 &amp;amp; 2 \\ 3 &amp;amp; 4 \end{bmatrix} = not defined&amp;lt;/math&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&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;&amp;lt;math&amp;gt;\begin{bmatrix} 1 &amp;amp; 2 &amp;amp; 3 \\ 4 &amp;amp; 5 &amp;amp; 6 \\ 7 &amp;amp; 8 &amp;amp; 9\end{bmatrix} + \begin{bmatrix} 1 &amp;amp; 2 \\ 3 &amp;amp; 4 \end{bmatrix} = &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;\text{&lt;/ins&gt;not defined&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;}&lt;/ins&gt;&amp;lt;/math&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&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;/td&gt;&lt;td class='diff-marker'&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;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&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;When two matrices are of the same dimension, then to add the two matrices you simply add each of the corresponding components.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&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;When two matrices are of the same dimension, then to add the two matrices you simply add each of the corresponding components.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&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;/td&gt;&lt;td class='diff-marker'&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;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&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;&amp;lt;math&amp;gt;\begin{bmatrix} 1 &amp;amp; -5 &amp;amp; 4 \\ 3 &amp;amp; 2 &amp;amp; -8 \\ 5 &amp;amp; -1 &amp;amp; -3\end{bmatrix} + \begin{bmatrix} 4 &amp;amp; 7 &amp;amp; 2\\ 1 &amp;amp; 5 &amp;amp; 7 \\ -3 &amp;amp; 2 &amp;amp; 5\end{bmatrix} = \begin{bmatrix} 5 &amp;amp; 2 &amp;amp; 6 \\ 4 &amp;amp; 7 &amp;amp; -1 \\ 2 &amp;amp; 1 &amp;amp; 2 \end{bmatrix}/math&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&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;&amp;lt;math&amp;gt;\begin{bmatrix} 1 &amp;amp; -5 &amp;amp; 4 \\ 3 &amp;amp; 2 &amp;amp; -8 \\ 5 &amp;amp; -1 &amp;amp; -3\end{bmatrix} + \begin{bmatrix} 4 &amp;amp; 7 &amp;amp; 2\\ 1 &amp;amp; 5 &amp;amp; 7 \\ -3 &amp;amp; 2 &amp;amp; 5\end{bmatrix} = \begin{bmatrix} 5 &amp;amp; 2 &amp;amp; 6 \\ 4 &amp;amp; 7 &amp;amp; -1 \\ 2 &amp;amp; 1 &amp;amp; 2 \end{bmatrix}&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;&amp;lt;&lt;/ins&gt;/math&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Tim Cobler</name></author>
	</entry>
	<entry>
		<id>https://gradwiki.math.ucr.edu/index.php?title=2.1&amp;diff=262&amp;oldid=prev</id>
		<title>Tim Cobler: Created page with &quot;Matrix Operations  ==Addition of Matrices== You can only add two matrices of the same dimensions. If the matrices are of different dimensions then the sum is not defined.   &lt;m...&quot;</title>
		<link rel="alternate" type="text/html" href="https://gradwiki.math.ucr.edu/index.php?title=2.1&amp;diff=262&amp;oldid=prev"/>
		<updated>2015-03-30T05:11:29Z</updated>

		<summary type="html">&lt;p&gt;Created page with &amp;quot;Matrix Operations  ==Addition of Matrices== You can only add two matrices of the same dimensions. If the matrices are of different dimensions then the sum is not defined.   &amp;lt;m...&amp;quot;&lt;/p&gt;
&lt;p&gt;&lt;b&gt;New page&lt;/b&gt;&lt;/p&gt;&lt;div&gt;Matrix Operations&lt;br /&gt;
&lt;br /&gt;
==Addition of Matrices==&lt;br /&gt;
You can only add two matrices of the same dimensions. If the matrices are of different dimensions then the sum is not defined. &lt;br /&gt;
&lt;br /&gt;
&amp;lt;math&amp;gt;\begin{bmatrix} 1 &amp;amp; 2 &amp;amp; 3 \\ 4 &amp;amp; 5 &amp;amp; 6 \\ 7 &amp;amp; 8 &amp;amp; 9\end{bmatrix} + \begin{bmatrix} 1 &amp;amp; 2 \\ 3 &amp;amp; 4 \end{bmatrix} = not defined&amp;lt;/math&amp;gt;&lt;br /&gt;
&lt;br /&gt;
When two matrices are of the same dimension, then to add the two matrices you simply add each of the corresponding components.&lt;br /&gt;
&lt;br /&gt;
&amp;lt;math&amp;gt;\begin{bmatrix} 1 &amp;amp; -5 &amp;amp; 4 \\ 3 &amp;amp; 2 &amp;amp; -8 \\ 5 &amp;amp; -1 &amp;amp; -3\end{bmatrix} + \begin{bmatrix} 4 &amp;amp; 7 &amp;amp; 2\\ 1 &amp;amp; 5 &amp;amp; 7 \\ -3 &amp;amp; 2 &amp;amp; 5\end{bmatrix} = \begin{bmatrix} 5 &amp;amp; 2 &amp;amp; 6 \\ 4 &amp;amp; 7 &amp;amp; -1 \\ 2 &amp;amp; 1 &amp;amp; 2 \end{bmatrix}/math&amp;gt;&lt;/div&gt;</summary>
		<author><name>Tim Cobler</name></author>
	</entry>
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