It is amusing to realize how much the basic concept of integration by parts is fruitful in mathematics and in mathematical physics. Here are some instances:
- Abel transformation
 - Schwinger-Dyson equation
 - Malliavin calculus
 - Schwartz-Sobolev distributions
 - Wick calculus
 - Stockes' theorem and Green's theorem
 - Chen-Stein method
 - Helffer-Sjöstrand formula
 
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