<img src="http://foxridge.mpiwg-berlin.mpg.de/permanent/einstein/annalen/Einst_Stati_de_1910/fulltext/img/Einst_Stati_de_191029x.png" alt=" integral t integral t ( ) @-Gx- 1- df- J = kx dt = @ z f - c Hy dt dt . 0 0 " class="par-math-display"/>
</center>
<p class="nopar"/>
<p class="noindent">Partielle Integration </p>
<center class="par-math-display">
<img src="http://foxridge.mpiwg-berlin.mpg.de/permanent/einstein/annalen/Einst_Stati_de_1910/fulltext/img/Einst_Stati_de_191030x.png" alt=" integral t integral t d-f t @-Hy- Hy d t dt = [Hy f]0- @ t f d t. 0 0 " class="par-math-display"/>
</center>
<p class="nopar"/>
<p class="noindent">Der erste Summand verschwindet, wenn man
<img src="http://foxridge.mpiwg-berlin.mpg.de/permanent/einstein/annalen/Einst_Stati_de_1910/fulltext/img/Einst_Stati_de_191031x.png" alt="1@-Hy- = @-Gz- - @-Gx-, c @ t @ x @ z " class="par-math-display"/>
</center>
<p class="nopar"/>
<p class="noindent">so gelangt man zu dem einfachen Ausdruck:</p>
<table width="100%" class="equation">
<tr>
<td>
<a id="x1-11r10"/>
<center class="math-display">
<img src="http://foxridge.mpiwg-berlin.mpg.de/permanent/einstein/annalen/Einst_Stati_de_1910/fulltext/img/Einst_Stati_de_191032x.png" alt=" t integral @ Gz J = -----f dt. 0 @ x " class="math-display"/>
</center>
</td>
<td width="5%">(10)</td>
</tr>
</table>
<p class="nopar"/>
<p class="noindent"/>
<p class="indent"> 1) Die von den Unregelmäßigkeiten des Strahlungsvorganges her-
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rührenden Impulse wechselnden Vorzeichens können nämlich für einen