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<div class="section" id="the-tex-input-processor">
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<span id="configure-tex"></span><h1>The TeX input processor<a class="headerlink" href="#the-tex-input-processor" title="Permalink to this headline">¶</a></h1>
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<p>The options below control the operation of the TeX input processor
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that is run when you include <tt class="docutils literal"><span class="pre">"input/TeX"</span></tt> in the <cite>jax</cite> array of
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your configuration. They are listed with their default values. To
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set any of these options, include a <tt class="docutils literal"><span class="pre">TeX</span></tt> section in your
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<tt class="xref py py-meth docutils literal"><span class="pre">MathJax.Hub.Config()</span></tt> call. For example</p>
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<div class="highlight-javascript"><div class="highlight"><pre><span class="nx">MathJax</span><span class="p">.</span><span class="nx">Hub</span><span class="p">.</span><span class="nx">Config</span><span class="p">({</span>
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<span class="nx">TeX</span><span class="o">:</span> <span class="p">{</span>
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<span class="nx">Macros</span><span class="o">:</span> <span class="p">{</span>
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<span class="nx">RR</span><span class="o">:</span> <span class="s1">'{\\bf R}'</span><span class="p">,</span>
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<span class="nx">bold</span><span class="o">:</span> <span class="p">[</span><span class="s1">'{\\bf #1}'</span><span class="p">,</span> <span class="mi">1</span><span class="p">]</span>
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<span class="p">}</span>
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<span class="p">}</span>
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<span class="p">});</span>
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</pre></div>
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</div>
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<p>would set the <tt class="docutils literal"><span class="pre">Macros</span></tt> configuration option to cause two new macros
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to be defined within the TeX input processor.</p>
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<dl class="describe">
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<dt>
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<tt class="descname">TagSide: "right"</tt></dt>
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<dd><p>This specifies the side on which <tt class="docutils literal"><span class="pre">\tag{}</span></tt> macros will place the
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tags. Set it to <tt class="docutils literal"><span class="pre">"left"</span></tt> to place the tags on the left-hand side.</p>
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</dd></dl>
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<dl class="describe">
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<dt>
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<tt class="descname">TagIndent: ".8em"</tt></dt>
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<dd><p>This is the amount of indentation (from the right or left) for the
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tags produced by the <tt class="docutils literal"><span class="pre">\tag{}</span></tt> macro.</p>
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</dd></dl>
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<dl class="describe">
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<dt>
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<tt class="descname">MultLineWidth: "85%"</tt></dt>
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<dd><p>The width to use for the <cite>multline</cite> environment that is part of
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the <tt class="docutils literal"><span class="pre">AMSmath</span></tt> extension. This width gives room for tags at
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either side of the equation, but if you are displaying mathematics
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in a small area or a thin column of text, you might need to change
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the value to leave sufficient margin for tags.</p>
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</dd></dl>
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<dl class="describe">
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<dt>
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<tt class="descname">Macros: {}</tt></dt>
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<dd><p>This lists macros to define before the TeX input processor begins.
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These are name:value pairs where the <cite>name</cite> gives the name of the TeX
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macro to be defined, and <cite>value</cite> gives the replacement text for the
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macro. The <cite>value</cite> canbe an array of the form <cite>[value,n]</cite>, where
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<cite>value</cite> is the replacement text and <cite>n</cite> is the number of parameters
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for the macro. Note that since the <cite>value</cite> is a javascript string,
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backslashes in the replacement text must be doubled to prevent them
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from acting as javascript escape characters.</p>
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<p>For example,</p>
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<div class="highlight-javascript"><div class="highlight"><pre><span class="nx">Macros</span><span class="o">:</span> <span class="p">{</span>
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<span class="nx">RR</span><span class="o">:</span> <span class="s1">'{\\bf R}'</span><span class="p">,</span>
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<span class="nx">bold</span><span class="o">:</span> <span class="p">[</span><span class="s1">'{\\bf #1}'</span><span class="p">,</span> <span class="mi">1</span><span class="p">]</span>
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<span class="p">}</span>
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</pre></div>
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</div>
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<p>would ask the TeX processor to define two new macros: <tt class="docutils literal"><span class="pre">\RR</span></tt>,
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which produces a bold-face “R”, and <tt class="docutils literal"><span class="pre">\bold{...}</span></tt>, which takes one
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parameter and set it in the bold-face font.</p>
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