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<p>Hi, thank you for your help yesterday. I am using the <i>amsmath </i>package as you suggested but for some reason the following command does not work;</p>
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<p>\begin{proof}</p>
<p>Trivial, use</p>
<p>\begin{equation}</p>
<p>E=mc^2</p>
<p>\end{equation}</p>
<p>\end{proof}</p>
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<p>I get an error message: !LaTeX Error: Environment proof undefined.</p>
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<p>I also tried to fake it by adding a square at the end of my proof with <i>\boxempty</i>. I also get an error message,</p>
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<p>How can I solve these problems using teX Live?</p>
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<p>Thank you</p>
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<p>Humberto</p>
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