Update 2022-03-22 10:53
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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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<!-- 2022-03-15 Tue 08:10 -->
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<!-- 2022-03-22 Tue 10:52 -->
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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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@@ -1630,14 +1630,14 @@ 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="orgc211f0a">
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<div class="eqlabel" id="orgd14f5e0">
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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="org36bff82">
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<div class="alteqlabels" id="orgdd168eb">
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</div>
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@@ -1652,14 +1652,14 @@ 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="orgf5f202e">
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<div class="eqlabel" id="org9e3195b">
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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="org25a65ef">
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<div class="alteqlabels" id="org7a39d73">
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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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@@ -1718,14 +1718,14 @@ 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="org4bb6b92">
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<div class="eqlabel" id="org01996f8">
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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="org482a454">
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<div class="alteqlabels" id="org518eefc">
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</div>
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@@ -1778,14 +1778,14 @@ 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="org96c7b40">
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<div class="eqlabel" id="org1ec3447">
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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="org550802d">
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<div class="alteqlabels" id="org832c6a2">
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</div>
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@@ -1797,8 +1797,8 @@ a point equals its value averaged over a sphere
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\]
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</p>
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<details id="org8644d79">
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<summary id="orgbe634df">
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<details id="org653c3ca">
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<summary id="org9063816">
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<strong>Physicist's proof</strong>
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</summary>
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<p>
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@@ -1860,8 +1860,8 @@ proving the theorem.
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</p>
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</details>
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<details id="orgb4be215">
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<summary id="orgb09f919">
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<details id="org086b4a6">
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<summary id="orgd2d3c6e">
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<strong>Formal proof</strong>
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</summary>
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@@ -1911,14 +1911,14 @@ 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="org51f491a">
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<div class="eqlabel" id="org6d0244a">
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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="org9bebf97">
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<div class="alteqlabels" id="org227c883">
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</div>
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@@ -1971,19 +1971,19 @@ 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="org02999c2">
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<div class="eqlabel" id="orga00aa93">
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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="org3cd554f">
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<div class="alteqlabels" id="orge0f050e">
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</div>
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</div>
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<div class="info div" id="org8708715">
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<div class="info div" id="org81fcf04">
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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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@@ -2102,7 +2102,7 @@ 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: 2022-03-15 Tue 08:10</p>
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<p class="date">Created: 2022-03-22 Tue 10:52</p>
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<p class="validation"></p>
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</div>
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