ENTROPY AND PROBABILITY 75
which became so important in his discovery of the light-quantum. He reinvented
Boltzmann's first definition of probability in terms of 'time spent.' His critical
position in regard to Boltzmann's second definition may have led him to replace
the 'Boltzmann logic,' W —» S, by the 'Einstein logic,' S —*• W. Out of his concern
with the foundations of statistical mechanics grew his vastly more important
applications to the theoretical determination of the Boltzmann constant. These
applications are the main topic of the next chapter, where we meet Einstein in the
year of his emergence, 1905. One of the reasons for his explosive creativity in that
year may well be the liberation he experienced in moving away from the highly
mathematical foundation questions which did not quite suit his scientific
temperament.
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