Editing Paul Ehrenfest (section)

==Quotes==
Ehrenfest used colourful German language in his physics lectures:<ref>{{cite book |last=Casimir |first=H.B.G. |authorlink=Hendrik Casimir |date=1983 |title=Haphazard Reality – Half a Century of Science |trans-title= |url= |language= |location=[[New York City|New York]] |publisher=[[Harper & Row]] |isbn= |chapter=Chapter 3. First years in Leiden}}</ref>
<blockquote>
Das ist der springende Punkt (translation: That is the crucial point)<br>
Das ist wo der Frosch ins Wasser springt (That is where the frog jumps into the water)<br>
Das ist der Patentanspruch (That is the patent claim, the essence)<br>
Da hat Herr ... schliesslich die Ratte aus der Suppe gezogen (There Mr. X finally pulled the rat out of the soup) [when a scientist had solved a messy problem]<br>
Je besser man's versteht um so besser steht es dort (The better one understands, the better it is written there) [Ehrenfest's comment when Dirac was asked in writing for an explanation of his work, and Dirac characteristically simply reproduced exactly his previous explanation]
</blockquote>