Until 1910, however, he continued to lecture in the calculus of differences.
2.
A couple examples : the 1911 article on Condensation of Gases, Geometrical Continuity, or Calculus of Differences.
3.
Later he lectured alternately on " introduction to analysis ", probability theory ( succeeding Chebyshev, who had left the university in 1882 ) and the calculus of differences.
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