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Summation by Parts


Summation by parts for discrete variables is the equivalent of integration by parts for continuous variables

 Delta^(-1)[v(x)Deltau(x)]=u(x)v(x)-Delta^(-1)[Eu(x)Deltav(x)],
(1)

or

 sum[v(x)Deltau(x)]=u(x)v(x)-sum[u(x+h)Deltav(x)],
(2)

where Delta^(-1) is the indefinite summation operator and the E-operator is defined by

 Ey(x)=y(x+h),
(3)

where h is any constant.


See also

Integration by Parts

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Cite this as:

Weisstein, Eric W. "Summation by Parts." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/SummationbyParts.html

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