Cauchy fractional theorem is also a cornersone for fractional calculus: both fractional integral and fractional derivative are defined via a generalization of Cauchy integral formula. There has been established a whole theory called fractional calculus
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@Jan Korbel: Cauchy fractional theorem is also a cornersone for fractional calculus...
Many thanks for pointing this out. What you have pointed out about the fractional calculus is very interesting. In Section 1.1.1, both the continuous and descrete forms of the Cauchy are covered in the theory of discrete fractional calculus in
Michael Holm, THE THEORY OF DISCRETE FRACTIONAL CALCULUS: