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<p><code>Julia</code> allows the use of <em>Unicode</em> symbols to replace variable names and for function calls. Unicode operations are entered in this pattern <code>\name[tab]</code>. That is a slash, <code>\</code>, the name (e.g., <code>alpha</code>), and then a press of the <code>tab</code> key.</p>
<p>In these notes, the following may appear as variable or function names</p>
<table class="table">
<thead>
<tr class="header">
<th style="text-align: left;"><code>\Name</code></th>
<th style="text-align: left;">Symbol</th>
<th style="text-align: left;">Usage notes</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td style="text-align: left;"><code>\euler</code></td>
<td style="text-align: left;"><code></code></td>
<td style="text-align: left;">The variable <code>e</code></td>
</tr>
<tr class="even">
<td style="text-align: left;"><code>\pi</code></td>
<td style="text-align: left;"><code>π</code></td>
<td style="text-align: left;"></td>
</tr>
<tr class="odd">
<td style="text-align: left;"><code>\alpha</code></td>
<td style="text-align: left;"><code>α</code></td>
<td style="text-align: left;"></td>
</tr>
<tr class="even">
<td style="text-align: left;"><code>\beta</code></td>
<td style="text-align: left;"><code>β</code></td>
<td style="text-align: left;"></td>
</tr>
<tr class="odd">
<td style="text-align: left;"><code>\delta</code></td>
<td style="text-align: left;"><code>δ</code></td>
<td style="text-align: left;"></td>
</tr>
<tr class="even">
<td style="text-align: left;"><code>\Delta</code></td>
<td style="text-align: left;"><code>Δ</code></td>
<td style="text-align: left;">Change, as in <code>Δx</code></td>
</tr>
<tr class="odd">
<td style="text-align: left;"><code>\gamma</code></td>
<td style="text-align: left;"><code>γ</code></td>
<td style="text-align: left;"></td>
</tr>
<tr class="even">
<td style="text-align: left;"><code>\phi</code></td>
<td style="text-align: left;"><code>ϕ</code></td>
<td style="text-align: left;"></td>
</tr>
<tr class="odd">
<td style="text-align: left;"><code>\Phi</code></td>
<td style="text-align: left;"><code>Φ</code></td>
<td style="text-align: left;">Used for parameterized surfaces</td>
</tr>
<tr class="even">
<td style="text-align: left;"><code>x\_1</code></td>
<td style="text-align: left;"><code>x₁</code></td>
<td style="text-align: left;">Subscripts</td>
</tr>
<tr class="odd">
<td style="text-align: left;"><code>r\vec</code></td>
<td style="text-align: left;"><code>r⃗</code></td>
<td style="text-align: left;">Vector annotation</td>
</tr>
<tr class="even">
<td style="text-align: left;"><code>T\hat</code></td>
<td style="text-align: left;"><code></code></td>
<td style="text-align: left;">Unit vector annotation</td>
</tr>
</tbody>
</table>
<p>The following are associated with derivatives</p>
<table class="table">
<thead>
<tr class="header">
<th style="text-align: left;"><code>\Name</code></th>
<th style="text-align: left;">Symbol</th>
<th style="text-align: left;">Usage notes</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td style="text-align: left;"><code>\partial</code></td>
<td style="text-align: left;"><code></code></td>
<td style="text-align: left;"></td>
</tr>
<tr class="even">
<td style="text-align: left;"><code>\nabla</code></td>
<td style="text-align: left;"><code></code></td>
<td style="text-align: left;">del operator in CwJ package</td>
</tr>
</tbody>
</table>
<p>The following are <em>infix</em> operators</p>
<table class="table">
<thead>
<tr class="header">
<th style="text-align: left;"><code>\Name</code></th>
<th style="text-align: left;">Symbol</th>
<th style="text-align: left;">Usage notes</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td style="text-align: left;"><code>\circ</code></td>
<td style="text-align: left;"><code></code></td>
<td style="text-align: left;">composition</td>
</tr>
<tr class="even">
<td style="text-align: left;"><code>\cdot</code></td>
<td style="text-align: left;"><code></code></td>
<td style="text-align: left;">dot product</td>
</tr>
<tr class="odd">
<td style="text-align: left;"><code>\times</code></td>
<td style="text-align: left;"><code>×</code></td>
<td style="text-align: left;">cross product</td>
</tr>
</tbody>
</table>
<p>Infix operators may need parentheses due to precedence rules. For example, to call a composition, one needs <code>(f ∘ g)(x)</code> so that composition happens before function evaluation (<code>g(x)</code>).</p>
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