Update 2022-02-17 08:44
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-19
@@ -1,7 +1,7 @@
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<!-- 2022-02-15 Tue 10:14 -->
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<!-- 2022-02-17 Thu 08:42 -->
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>Pre-Quantum Electrodynamics</title>
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@@ -1614,14 +1614,14 @@ In one dimension, the potential is a single-variable
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function \(\phi (x)\) and the Laplace equation reads
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</p>
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<div class="eqlabel" id="orgdfca409">
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<div class="eqlabel" id="org20933f1">
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<p>
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<a id="Lap_1d"></a><a href="./ems_ca_fe_L.html#Lap_1d"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-link" viewBox="0 0 16 16">
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<path d="M6.354 5.5H4a3 3 0 0 0 0 6h3a3 3 0 0 0 2.83-4H9c-.086 0-.17.01-.25.031A2 2 0 0 1 7 10.5H4a2 2 0 1 1 0-4h1.535c.218-.376.495-.714.82-1z"/>
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<path d="M9 5.5a3 3 0 0 0-2.83 4h1.098A2 2 0 0 1 9 6.5h3a2 2 0 1 1 0 4h-1.535a4.02 4.02 0 0 1-.82 1H12a3 3 0 1 0 0-6H9z"/>
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</svg></a>
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</p>
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<div class="alteqlabels" id="org36d5863">
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<div class="alteqlabels" id="org1705801">
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</div>
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@@ -1636,14 +1636,14 @@ function \(\phi (x)\) and the Laplace equation reads
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<p>
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The solution to this is
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</p>
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<div class="eqlabel" id="orga37bc11">
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<div class="eqlabel" id="orgc9124d1">
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<p>
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<a id="Lap_1d_sol"></a><a href="./ems_ca_fe_L.html#Lap_1d_sol"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-link" viewBox="0 0 16 16">
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<path d="M6.354 5.5H4a3 3 0 0 0 0 6h3a3 3 0 0 0 2.83-4H9c-.086 0-.17.01-.25.031A2 2 0 0 1 7 10.5H4a2 2 0 1 1 0-4h1.535c.218-.376.495-.714.82-1z"/>
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<path d="M9 5.5a3 3 0 0 0-2.83 4h1.098A2 2 0 0 1 9 6.5h3a2 2 0 1 1 0 4h-1.535a4.02 4.02 0 0 1-.82 1H12a3 3 0 1 0 0-6H9z"/>
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</svg></a>
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</p>
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<div class="alteqlabels" id="orgc5114c3">
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<div class="alteqlabels" id="org566337b">
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<ul class="org-ul">
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<li>Gr (3.6)</li>
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</ul>
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@@ -1702,14 +1702,14 @@ In two dimensions, the potential becomes a function
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of two variables (here: \(x\) and \(y\)), so Laplace's
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equation now reads
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</p>
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<div class="eqlabel" id="orgc587278">
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<div class="eqlabel" id="org0af82b1">
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<p>
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<a id="Lap_2d"></a><a href="./ems_ca_fe_L.html#Lap_2d"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-link" viewBox="0 0 16 16">
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<path d="M6.354 5.5H4a3 3 0 0 0 0 6h3a3 3 0 0 0 2.83-4H9c-.086 0-.17.01-.25.031A2 2 0 0 1 7 10.5H4a2 2 0 1 1 0-4h1.535c.218-.376.495-.714.82-1z"/>
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<path d="M9 5.5a3 3 0 0 0-2.83 4h1.098A2 2 0 0 1 9 6.5h3a2 2 0 1 1 0 4h-1.535a4.02 4.02 0 0 1-.82 1H12a3 3 0 1 0 0-6H9z"/>
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</svg></a>
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</p>
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<div class="alteqlabels" id="orgd96eb38">
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<div class="alteqlabels" id="orgf05a1be">
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</div>
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@@ -1762,14 +1762,14 @@ a point equals its value averaged over a sphere
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\(S_R({\bf r})\) of any radius \(R\) centered on this point
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(and of course not containing any charges),
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</p>
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<div class="eqlabel" id="orgf7426f4">
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<div class="eqlabel" id="org45554bc">
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<p>
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<a id="p_ball_avg"></a><a href="./ems_ca_fe_L.html#p_ball_avg"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-link" viewBox="0 0 16 16">
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<path d="M6.354 5.5H4a3 3 0 0 0 0 6h3a3 3 0 0 0 2.83-4H9c-.086 0-.17.01-.25.031A2 2 0 0 1 7 10.5H4a2 2 0 1 1 0-4h1.535c.218-.376.495-.714.82-1z"/>
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<path d="M9 5.5a3 3 0 0 0-2.83 4h1.098A2 2 0 0 1 9 6.5h3a2 2 0 1 1 0 4h-1.535a4.02 4.02 0 0 1-.82 1H12a3 3 0 1 0 0-6H9z"/>
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</svg></a>
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</p>
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<div class="alteqlabels" id="org1c3162d">
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<div class="alteqlabels" id="org242a219">
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</div>
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@@ -1781,8 +1781,8 @@ a point equals its value averaged over a sphere
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\]
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</p>
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<details id="orgbc3026b">
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<summary id="orge4e657e">
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<details id="orgeb8b5b8">
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<summary id="org92de027">
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<strong>Physicist's proof</strong>
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</summary>
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<p>
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@@ -1844,8 +1844,8 @@ proving the theorem.
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</p>
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</details>
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<details id="orgf289197">
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<summary id="orge3fd0c7">
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<details id="org2eee056">
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<summary id="orgf338007">
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<strong>Formal proof</strong>
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</summary>
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@@ -1895,14 +1895,14 @@ we get the following general
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<p>
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<b>Theorem</b>:
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</p>
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<div class="eqlabel" id="orgd8bf4d9">
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<div class="eqlabel" id="org723ed6d">
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<p>
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<a id="dfdR_intLap"></a><a href="./ems_ca_fe_L.html#dfdR_intLap"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-link" viewBox="0 0 16 16">
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<path d="M6.354 5.5H4a3 3 0 0 0 0 6h3a3 3 0 0 0 2.83-4H9c-.086 0-.17.01-.25.031A2 2 0 0 1 7 10.5H4a2 2 0 1 1 0-4h1.535c.218-.376.495-.714.82-1z"/>
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<path d="M9 5.5a3 3 0 0 0-2.83 4h1.098A2 2 0 0 1 9 6.5h3a2 2 0 1 1 0 4h-1.535a4.02 4.02 0 0 1-.82 1H12a3 3 0 1 0 0-6H9z"/>
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</svg></a>
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</p>
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<div class="alteqlabels" id="org49a36be">
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<div class="alteqlabels" id="org447b5bf">
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</div>
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@@ -1955,19 +1955,19 @@ are necessarily positive, we thus require \(f_x > 0\), \(f_y > 0\) and \(f
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of the \(f_x + f_y + f_z = 0\) condition above.
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</p>
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<div class="eqlabel" id="orgfeb6aae">
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<div class="eqlabel" id="org7f931db">
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<p>
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<a id="Earnshaw"></a><a href="./ems_ca_fe_L.html#Earnshaw"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-link" viewBox="0 0 16 16">
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<path d="M6.354 5.5H4a3 3 0 0 0 0 6h3a3 3 0 0 0 2.83-4H9c-.086 0-.17.01-.25.031A2 2 0 0 1 7 10.5H4a2 2 0 1 1 0-4h1.535c.218-.376.495-.714.82-1z"/>
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<path d="M9 5.5a3 3 0 0 0-2.83 4h1.098A2 2 0 0 1 9 6.5h3a2 2 0 1 1 0 4h-1.535a4.02 4.02 0 0 1-.82 1H12a3 3 0 1 0 0-6H9z"/>
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</svg></a>
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</p>
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<div class="alteqlabels" id="org7f4d8f6">
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<div class="alteqlabels" id="orgfc31737">
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</div>
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</div>
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<div class="info div" id="orgf970a43">
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<div class="info div" id="org181f62a">
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<p>
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<b>Earnshaw's theorem (physical version)</b> <br>
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</p>
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@@ -2086,7 +2086,7 @@ target="_blank">Creative Commons Attribution 4.0 International License</a>.
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</div>
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<div id="postamble" class="status">
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<p class="author">Author: Jean-Sébastien Caux</p>
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<p class="date">Created: 2022-02-15 Tue 10:14</p>
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<p class="date">Created: 2022-02-17 Thu 08:42</p>
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<p class="validation"></p>
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</div>
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