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@ -390,6 +390,18 @@
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<span class="k">return</span> <span class="n">result_dict</span>
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<span class="k">def</span> <span class="nf">_epsilon_tensor</span><span class="p">(</span><span class="n">i</span><span class="p">,</span> <span class="n">j</span><span class="p">,</span> <span class="n">k</span><span class="p">,</span> <span class="n">o</span><span class="p">):</span>
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<span class="sd">"""Rank-4 epsilon tensor</span>
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<span class="sd"> Extension of https://codegolf.stackexchange.com/a/160375</span>
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<span class="sd"> """</span>
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<span class="n">test_set</span> <span class="o">=</span> <span class="nb">set</span><span class="p">((</span><span class="n">i</span><span class="p">,</span> <span class="n">j</span><span class="p">,</span> <span class="n">k</span><span class="p">,</span> <span class="n">o</span><span class="p">))</span>
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<span class="k">if</span> <span class="ow">not</span> <span class="p">(</span><span class="n">test_set</span> <span class="o"><=</span> <span class="nb">set</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">))</span> <span class="ow">or</span> <span class="n">test_set</span> <span class="o"><=</span> <span class="nb">set</span><span class="p">((</span><span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">))):</span>
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<span class="k">raise</span> <span class="ne">Exception</span><span class="p">(</span><span class="s2">"Unexpected input"</span><span class="p">,</span> <span class="n">i</span><span class="p">,</span> <span class="n">j</span><span class="p">,</span> <span class="n">k</span><span class="p">,</span> <span class="n">o</span><span class="p">)</span>
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<span class="k">return</span> <span class="p">(</span><span class="n">i</span> <span class="o">-</span> <span class="n">j</span><span class="p">)</span> <span class="o">*</span> <span class="p">(</span><span class="n">j</span> <span class="o">-</span> <span class="n">k</span><span class="p">)</span> <span class="o">*</span> <span class="p">(</span><span class="n">k</span> <span class="o">-</span> <span class="n">i</span><span class="p">)</span> <span class="o">*</span> <span class="p">(</span><span class="n">i</span> <span class="o">-</span> <span class="n">o</span><span class="p">)</span> <span class="o">*</span> <span class="p">(</span><span class="n">j</span> <span class="o">-</span> <span class="n">o</span><span class="p">)</span> <span class="o">*</span> <span class="p">(</span><span class="n">o</span> <span class="o">-</span> <span class="n">k</span><span class="p">)</span> <span class="o">/</span> <span class="mi">12</span>
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<span class="k">def</span> <span class="nf">_get_lorentz_names</span><span class="p">(</span><span class="n">name</span><span class="p">):</span>
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<span class="k">assert</span> <span class="nb">len</span><span class="p">(</span><span class="n">name</span><span class="p">)</span> <span class="o">==</span> <span class="mi">2</span>
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