![](http://www.alamy.com/thumbs/6/AF54C326-5EF7-488E-AB3F-FA3B53B15637/KET9XK.jpg)
Paul Ehrenfest, 1880 - 1933, Austrian Dutch Theoretical Physicist
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Keywords: catastrophe, effect, ehrenfest, equations, mechanics, paradox, phase, portrait, quantum, statistical, theorem, time, tolman, transition, ultraviolet